<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000">Julio, </div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000">The result indeed looks fine, but I'm not sure about what it represents. When you do:</div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000">set x 1</div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000">set y 1</div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000">It means (for my variable):</div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000">LON set to 0 0</div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000">LAT set to -90 -90</div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000">So the area is set to a point. I don't undersand the relation between these coordinates and the LAT and LON limits you used to define the rectangle for the "aave" function. So I'm not sure about what that plot represents. The tloop-part is prefect.</div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000">Thanks once more,</div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#000000"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 20 November 2014 13:17, Julio Martinez <span dir="ltr"><<a href="mailto:julioms24@hotmail.com" target="_blank">julioms24@hotmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div dir="ltr">David<div><br></div><div>This is what I get when executing</div><div><br></div><div>set y 1</div><div>set x 1</div><div>set t 1 last</div><div>d tloop(sqrt(pow(aave(uwnd,lon=200,lon=300,lat=0,lat=30)-uwnd,2)))</div><div><br></div><div>Im not sure if this is what you are expecting.</div><div>Please let me know.</div><div><br></div><div><br></div><div><br></div><div><span class=""><br><br><span><font color="#888888">Julio N. Martínez Sánchez<br>M.C. en Oceanografía Física<br>Consultor en Sitio</font></span><div><font color="#888888">Subgerencia de Pronóstico a Mediano y Largo Plazo</font></div><div><font color="#888888">Gerencia de Meteorología y Climatología</font></div><div><font color="#888888">Servicio Meteorológico Nacional</font></div><div><font color="#888888">Ext. 3156</font></div><br><br></span><div><hr>From: <a href="mailto:davidnielsen@id.uff.br" target="_blank">davidnielsen@id.uff.br</a><br>Date: Thu, 20 Nov 2014 12:22:20 -0200<br>To: <a href="mailto:sourabhbal@gmail.com" target="_blank">sourabhbal@gmail.com</a><br>CC: <a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><div><div class="h5"><br>Subject: Re: [gradsusr] Standard deviation of an area<br><br><div dir="ltr"><div style="font-family:tahoma,sans-serif;color:#000000">Sourabh,</div><div style="font-family:tahoma,sans-serif;color:#000000"><br></div><div style="font-family:tahoma,sans-serif;color:#000000">First, if you want it to run from t=1 to 21, you should fix the loop to "while (count < 22)", so that it will run until t=21.<br></div><div style="font-family:tahoma,sans-serif;color:#000000"><br></div><div style="font-family:tahoma,sans-serif;color:#000000">However, it will generate you a single number for each t: an average of the variable on the rectangle you defined, not a plot as you wish. I'm also curious to hear suggestions for that now.</div><div style="font-family:tahoma,sans-serif;color:#000000"><br></div><div style="font-family:tahoma,sans-serif;color:#000000">Good luck,</div><div style="font-family:tahoma,sans-serif;color:#000000"><br></div><div style="font-family:tahoma,sans-serif;color:#000000"><br></div></div><div><br><div>On 20 November 2014 11:45, Sourabh Bal <span dir="ltr"><<a href="mailto:sourabhbal@gmail.com" target="_blank">sourabhbal@gmail.com</a>></span> wrote:<br><blockquote style="border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hi David, <br><br></div>Thanks for your suggestion. I tried with the following <br>'reinit'<br>'open SSt12.precip.lon-lat.allssws.ctl'<br><br>'x1=1000*24*60*60*(aprl+aprc)'<br>while (count<1)<br>'set t' count<br>'define area=aave(x1,lon=120,lon=180,lat=-90,lat=90)<br>'d area'<br>'enable print figure1.zonalpre120-180E.mf'<br>'print'<br>'disable print'<br>'!./gxeps -c -i figure1.zonalpre120-180E.mf -o SSt12.preci.120-180E.all.ssws.eps'<br>count=count+1<br>endwhile<br><br><br><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">but does not yield my result. <br><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">After running the script there is no error but the eps file produced is blank. <br><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">Actually I want zonal average over longitude (120 to 180). The plot would be X as time ( t=1 to t =21) and Y as latitude (90N to 90S). More over I also want calculate statistical significance (t test values) over this plot ( may be in shaded). <br><br><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">Please help me<span><font color="#888888"><br><br></font></span></div><span><font color="#888888"><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">Sourabh<br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br><br><br><br><br></div><br></font></span></div><div><div><div><br><div>On Thu, Nov 20, 2014 at 2:00 PM, David Nielsen <span dir="ltr"><<a href="mailto:davidnielsen@id.uff.br" target="_blank">davidnielsen@id.uff.br</a>></span> wrote:<br><blockquote style="border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div style="font-family:tahoma,sans-serif;color:#000000">Julio, </div><div style="font-family:tahoma,sans-serif;color:#000000"><br></div><div style="font-family:tahoma,sans-serif;color:#000000">The way you suggested still returned a gridded result, not a number representig the area. Then I tried averaging the result over the same area (everything for each t-value):</div><div style="font-family:tahoma,sans-serif;color:#000000"><br></div><div style="font-family:tahoma,sans-serif;color:#000000"> define var1 = sqrt( pow( aave( sst, lat=..., lon=...)))</div><div style="font-family:tahoma,sans-serif;color:#000000"> define var2 = aave( var1, lat=..., lon=...)</div><div style="font-family:tahoma,sans-serif;color:#000000"><br></div><div style="font-family:tahoma,sans-serif;color:#000000">Does it make any sense to you?</div><div style="font-family:tahoma,sans-serif;color:#000000"><br></div><div style="font-family:tahoma,sans-serif;color:#000000">Thanks again!</div><div style="font-family:tahoma,sans-serif;color:#000000"><br></div><div style="font-family:tahoma,sans-serif;color:#000000"><br></div><div style="font-family:tahoma,sans-serif;color:#000000">Sourabh, </div><div style="font-family:tahoma,sans-serif;color:#000000"><br></div><div style="font-family:tahoma,sans-serif;color:#000000">So just checked, you can do:</div><span><div style="font-family:tahoma,sans-serif;color:#000000"><br></div><div style="font-family:tahoma,sans-serif;color:#000000">while (count < 22)</div><div style="font-family:tahoma,sans-serif;color:#000000"> 'set t' count</div></span><div style="font-family:tahoma,sans-serif;color:#000000"> 'define area = aave (variable-name, lon=120, lon=180, lat=-90, lat-90)</div><div style="font-family:tahoma,sans-serif;color:#000000"> 'd area'</div><div style="font-family:tahoma,sans-serif;color:#000000"> count = count +1</div><div style="font-family:tahoma,sans-serif;color:#000000">endwhile</div><div style="font-family:tahoma,sans-serif;color:#000000"><br></div><div style="font-family:tahoma,sans-serif;color:#000000">Works as fine as defining the area with x and y. Very small numerical difference though, don't know why. </div><div><div><div><br><div>On 20 November 2014 10:23, David Nielsen <span dir="ltr"><<a href="mailto:davidnielsen@id.uff.br" target="_blank">davidnielsen@id.uff.br</a>></span> wrote:<br><blockquote style="border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">Sourabh, </div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">You can try:</div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><div style="font-size:13.3333339691162px">while (count < 22)</div><div style="font-size:13.3333339691162px"> 'set t 'count</div><div style="font-size:13.3333339691162px"> 'define average=ave("variable-name", x and y limits)' </div><div style="font-size:13.3333339691162px"> 'd average' </div><div style="font-size:13.3333339691162px"> count=count+1</div><div style="font-size:13.3333339691162px">endwhile</div></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">You have to express lat and lon in terms of x and y in the "ave" formula. For that, open the file in Grads and:</div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">set lat -90 90</div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">q dim</div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">And it will tell you the equivalente x limits, for example.</div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">Not sure about this must, though. You can check it here: <a href="http://www.iges.org/grads/gadoc/gradfuncave.html" target="_blank">http://www.iges.org/grads/gadoc/gradfuncave.html</a></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">Hope it helps!</div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">Julio, I will try your suggestion now! Thanks again!</div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div></div><div><div><div><br><div>On 20 November 2014 09:39, Sourabh Bal <span dir="ltr"><<a href="mailto:sourabhbal@gmail.com" target="_blank">sourabhbal@gmail.com</a>></span> wrote:<br><blockquote style="border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div><div><div><div>Hello David and Julio, <br><br></div>if I want to plot time-latitude cross section (Y and T
varying), with the data being averaged over longitude (120 to 180),<code> where shall I fix the longitude. <br><br></code></div><code>set lat -90 90<br></code></div><code>set lon ??????<br></code></div><code>set t 1 21<br></code></div><code>d tloop(ave(aprl,lon=120,lon=180))<br><br><br></code></div><code>Sourabh<br></code><div><div><div><div><div><div><code><br><br></code></div></div></div></div></div></div></div><div><div><div><br><div>On Thu, Nov 20, 2014 at 1:35 AM, Julio Martinez <span dir="ltr"><<a href="mailto:julioms24@hotmail.com" target="_blank">julioms24@hotmail.com</a>></span> wrote:<br><blockquote style="border-left:1px #ccc solid;padding-left:1ex">
<div><div dir="ltr"><font style="font-size:10pt" color="#2672EC" face="Calibri,sans-serif"><b>David,</b></font><div><br></div><div><font style="font-size:10pt" color="#2672EC" face="Calibri,sans-serif"><b>Maybe you could try with</b></font></div><div><font style="font-size:10pt" color="#2672EC" face="Calibri,sans-serif"><b><br></b></font></div><div><font style="font-size:10pt" color="#2672EC" face="Calibri,sans-serif"><b>d tloop(sqrt(pow(aave(uwnd,lon=200,lon=300,lat=0,lat=30),-uwnd,2)))</b></font></div><div><font style="font-size:10pt" color="#2672EC" face="Calibri,sans-serif"><b><br></b></font></div><div><span><font style="font-size:10pt" color="#2672EC" face="Calibri,sans-serif"><b><br></b></font><br><br><span><font color="#888888">Julio N. Martínez Sánchez<br>M.C. en Oceanografía Física<br>Consultor en Sitio</font></span><div><font color="#888888">Subgerencia de Pronóstico a Mediano y Largo Plazo</font></div><div><font color="#888888">Gerencia de Meteorología y Climatología</font></div><div><font color="#888888">Servicio Meteorológico Nacional</font></div><div><font color="#888888">Ext. 3156</font></div><br><br></span><div><hr>From: <a href="mailto:davidnielsen@id.uff.br" target="_blank">davidnielsen@id.uff.br</a><br>Date: Wed, 19 Nov 2014 21:13:14 -0200<br>To: <a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><br>Subject: Re: [gradsusr] Standard deviation of an area<div><div><br><br><div dir="ltr"><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">Hi, Julio, </div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">My problem is not with the loop in time. I am using a "While" sintax to execute the average along the series:</div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><div>while (count < "number of t-values +1")</div><div> 'set t 'count</div><div> 'define average=aave(sst,x=127.8,x=128.6,y=27.6,y=28.6)'</div><div> 'd average' </div><div> average=subwrd(result,4)</div><div> rc = write ("c:\path\file.txt",average)</div><div> count=count+1</div><div>endwhile</div><div><br></div><div>This is working fine. What I need now, is a way to calculate the standard deviation of SST in the area of interest, also for each value of t, like something independent of time, for me to insert inside the loop. </div><div><br></div><div>Everything Ive seen before is a standard deviation of the whole series (like below), and not for each time-value.</div><div><br></div><div><span style="font-size:13.3333339691162px">'define sdsst=sqrt(ave(pow(ave(sst,t=</span><span style="font-size:13.3333339691162px">1,t=12)-sst,2),t=1,t=12))' -> calculates std of the series between t=1 and t=2. What I'd like to do is, for each t, an std of the area.</span><br></div><div><br></div><div>Any suggestions?</div><div><br></div><div>Thanks!</div></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div></div><div><br><div>On 19 November 2014 13:38, Julio Martinez <span dir="ltr"><<a href="mailto:julioms24@hotmail.com" target="_blank">julioms24@hotmail.com</a>></span> wrote:<br><blockquote style="border-left:1px #ccc solid;padding-left:1ex">
<div><div dir="ltr"><font style="font-size:10pt" color="#2672EC" face="Calibri,sans-serif"><b>Hi David,</b></font><div><font style="font-size:10pt" color="#2672EC" face="Calibri,sans-serif"><b><br></b></font></div><div><font style="font-size:10pt" color="#2672EC" face="Calibri,sans-serif"><b>I think you could try with tloop command...<br></b></font><br><br><span><font color="#888888">Julio N. Martínez Sánchez<br>M.C. en Oceanografía Física<br>Consultor en Sitio</font></span><div><font color="#888888">Subgerencia de Pronóstico a Mediano y Largo Plazo</font></div><div><font color="#888888">Gerencia de Meteorología y Climatología</font></div><div><font color="#888888">Servicio Meteorológico Nacional</font></div><div><font color="#888888">Ext. 3156</font></div><br><br><div><hr>From: <a href="mailto:davidnielsen@id.uff.br" target="_blank">davidnielsen@id.uff.br</a><br>Date: Wed, 19 Nov 2014 13:12:34 -0200<br>To: <a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><br>Subject: [gradsusr] Standard deviation of an area<div><div><br><br><div dir="ltr"><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">Dear all grads users, </div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">I would like to calculate the standard deviation of an area in Grads.</div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">I have a NetCDF wekly time series of SST (attached), and I am able to calculate the average of a certain area (defining LAT and LON) value using the "aave" formula, for each value of time, and generate a new series - ok. In addition to this seires, I would like to generate a series of standard deviations of this average, also for each time in the series. In other words, I need to to know, for a given area and time, what is the standard deviation of my variable?</div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">Please find attached an example of a NetCDF file I want to treat this way: </div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">1. Calculate average of SST in a certain area (lat, lon) using aave, for each time value</div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">2. Calculate standard deviation of SST in a certain area (lat, lon), for each time value</div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">Would anybody have any kind suggestions on how to address this #2 task?</div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)">Many thanks in advance,</div><div style="font-family:tahoma,sans-serif;color:rgb(0,0,0)"><br></div><br clear="all"><div><br></div>-- <br><div><div dir="ltr"><font color="#20124d" face="tahoma, sans-serif">David Marcolino Nielsen</font><div><font color="#20124d" face="tahoma, sans-serif">Engenharia de Recursos Hídricos e do Meio Ambiente</font></div><div><font color="#20124d" face="tahoma, sans-serif">Universidade Federal Fluminense</font></div><div><font color="#20124d" face="tahoma, sans-serif"><a href="mailto:davidnielsen@id.uff.br" target="_blank">davidnielsen@id.uff.br</a></font></div></div></div></div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div><div dir="ltr"><font color="#20124d" face="tahoma, sans-serif">David Marcolino Nielsen</font><div><font color="#20124d" face="tahoma, sans-serif">Engenharia de Recursos Hídricos e do Meio Ambiente</font></div><div><font color="#20124d" face="tahoma, sans-serif">Universidade Federal Fluminense</font></div><div><font color="#20124d" face="tahoma, sans-serif"><a href="mailto:davidnielsen@id.uff.br" target="_blank">davidnielsen@id.uff.br</a></font></div></div></div>
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<br></blockquote></div><br><br clear="all"><br>-- <br></div></div><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr">Dr. Sourabh Bal</div><div dir="ltr">Post-Doc Fellow </div><div dir="ltr">Institute of Meteorology, Freie Universitat, Berlin<div><br></div><div><br><br></div></div></div></div></div></div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div><div dir="ltr"><font color="#20124d" face="tahoma, sans-serif">David Marcolino Nielsen</font><div><font color="#20124d" face="tahoma, sans-serif">Engenharia de Recursos Hídricos e do Meio Ambiente</font></div><div><font color="#20124d" face="tahoma, sans-serif">Universidade Federal Fluminense</font></div><div><font color="#20124d" face="tahoma, sans-serif"><a href="mailto:davidnielsen@id.uff.br" target="_blank">davidnielsen@id.uff.br</a></font></div></div></div>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div><div dir="ltr"><font color="#20124d" face="tahoma, sans-serif">David Marcolino Nielsen</font><div><font color="#20124d" face="tahoma, sans-serif">Engenharia de Recursos Hídricos e do Meio Ambiente</font></div><div><font color="#20124d" face="tahoma, sans-serif">Universidade Federal Fluminense</font></div><div><font color="#20124d" face="tahoma, sans-serif"><a href="mailto:davidnielsen@id.uff.br" target="_blank">davidnielsen@id.uff.br</a></font></div></div></div>
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<br></blockquote></div><br><br clear="all"><br>-- <br><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr">Dr. Sourabh Bal</div><div dir="ltr">Post-Doc Fellow </div><div dir="ltr">Institute of Meteorology, Freie Universitat, Berlin<div><br></div><div><br><br></div></div></div></div></div></div>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div><div dir="ltr"><font face="tahoma, sans-serif" color="#20124d">David Marcolino Nielsen</font><div><font face="tahoma, sans-serif" color="#20124d">Engenharia de Recursos Hídricos e do Meio Ambiente</font></div><div><font face="tahoma, sans-serif" color="#20124d">Universidade Federal Fluminense</font></div><div><font face="tahoma, sans-serif" color="#20124d"><a href="mailto:davidnielsen@id.uff.br" target="_blank">davidnielsen@id.uff.br</a></font></div></div></div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><font face="tahoma, sans-serif" color="#20124d">David Marcolino Nielsen</font><div><font face="tahoma, sans-serif" color="#20124d">Engenharia de Recursos Hídricos e do Meio Ambiente</font></div><div><font face="tahoma, sans-serif" color="#20124d">Universidade Federal Fluminense</font></div><div><font face="tahoma, sans-serif" color="#20124d"><a href="mailto:davidnielsen@id.uff.br" target="_blank">davidnielsen@id.uff.br</a></font></div></div></div>
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