<div dir="ltr">unsubscribe</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, May 9, 2021 at 8:08 PM <<a href="mailto:gradsusr-request@gradsusr.org">gradsusr-request@gradsusr.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Send gradsusr mailing list submissions to<br>
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   1. Re: (no subject) (James Potemra)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Sun, 9 May 2021 14:57:44 -1000<br>
From: James Potemra <<a href="mailto:jimp@hawaii.edu" target="_blank">jimp@hawaii.edu</a>><br>
To: GrADS Users Forum <<a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a>>, Evgeny Gavrilov<br>
        <<a href="mailto:eugen420@gmail.com" target="_blank">eugen420@gmail.com</a>><br>
Subject: Re: [gradsusr] (no subject)<br>
Message-ID: <<a href="mailto:3f2cf1cd-bfd2-06c4-c7e6-cb01bb310967@hawaii.edu" target="_blank">3f2cf1cd-bfd2-06c4-c7e6-cb01bb310967@hawaii.edu</a>><br>
Content-Type: text/plain; charset="utf-8"; Format="flowed"<br>
<br>
Evgeny,<br>
<br>
You have a lot of curiosities in your script.? First, it's never a good <br>
to mix GrADS variables (e.g., "t") with your own:<br>
<br>
'set t 1 20'<br>
'define t=tmpprs(lev=850)'<br>
<br>
instead of 'define t=' maybe make this 'define temp=' or something like <br>
that.? Second, you have<br>
<br>
'define a = thetae'<br>
<br>
but thetae is not defined anywhere.? Third, no need set time range every <br>
time you define the variables; set it once.? Finally, as Jeff suggested <br>
a while back, you'll need to add quotes to get the time index as a number:<br>
<br>
'd a - a(t-1)' --> 'd a - a(t='i-1')<br>
<br>
---------------------------<br>
<br>
* set URL for data<br>
'sdfopen <br>
<a href="https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210509/gfs_0p25_12z" rel="noreferrer" target="_blank">https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210509/gfs_0p25_12z</a>'<br>
<br>
* define lat/lon/time ranges<br>
'set lon 30 50'<br>
'set lat 40 50'<br>
'set t 1 81'<br>
<br>
* define variables<br>
'define temp=tmpprs(lev=850)'<br>
'define rh=rhprs(lev=850)'<br>
'define <br>
dewp850mb=(t-273.15)-((14.55+0.114*(t-273.15))*(1-0.01*rh)+pow((2.5+0.007*(t-273.15))*(1-0.01*rh),3)+(15.9+0.117*(t-273.15))*pow((1-0.01*rh),14))'<br>
'define vapr850mb=6.112*exp((17.67*dewp850mb)/(dewp850mb+243.5))'<br>
'define e850mb=vapr850mb*1.001+(850-100)/900*0.0034'<br>
'define w850mb=0.62197*(e850mb/(850-e850mb))'<br>
'define te850mb=(t+(2260000*w850mb/1004))'<br>
'define epa=(te850mb*pow((1000/850),(287/1004)))-273.16'<br>
<br>
* draw maps<br>
maps = 20<br>
'set display color white'<br>
i = 1<br>
while ( i<maps )<br>
 ? 'set t ' i<br>
 ? 'set gxout shaded'<br>
* I have not idea what you want to do, but this will display the <br>
difference between the current timestep and the one prior<br>
 ? 'd temp - temp(t='i-1')'<br>
 ? 'cbarn'<br>
 ? 'clear'<br>
 ? i=i+1<br>
endwhile<br>
<br>
-------------------------<br>
<br>
<br>
On 5/9/21 9:02 AM, Evgeny Gavrilov wrote:<br>
> All the same. The?maps are not drawn<br>
><br>
> You can run my script:<br>
><br>
> 'reinit'<br>
><br>
> 'sdfopen <br>
> <a href="https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210509/gfs_0p25_12z" rel="noreferrer" target="_blank">https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210509/gfs_0p25_12z</a> <br>
> <<a href="https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210509/gfs_0p25_12z" rel="noreferrer" target="_blank">https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210509/gfs_0p25_12z</a>>'<br>
><br>
> 'set lon 30 50'<br>
> 'set lat 40 50'<br>
><br>
> 'set display color white'<br>
><br>
> maps = 20<br>
> ? i = 1<br>
> ? while ( i<maps )<br>
> 'set t ' i<br>
><br>
> 'set t 1 20'<br>
> 'define t=tmpprs(lev=850)'<br>
> 'set t 1 20'<br>
> 'define rh=rhprs(lev=850)'<br>
> 'set t 1 20'<br>
> 'define <br>
> dewp850mb=(t-273.15)-((14.55+0.114*(t-273.15))*(1-0.01*rh)+pow((2.5+0.007*(t-273.15))*(1-0.01*rh),3)+(15.9+0.117*(t-273.15))*pow((1-0.01*rh),14))'<br>
> 'set t 1 20'<br>
> 'define vapr850mb=6.112*exp((17.67*dewp850mb)/(dewp850mb+243.5))'<br>
> 'set t 1 20'<br>
> 'define e850mb=vapr850mb*1.001+(850-100)/900*0.0034'<br>
> 'set t 1 20'<br>
> 'define w850mb=0.62197*(e850mb/(850-e850mb))'<br>
> 'set t 1 20'<br>
> 'define te850mb=(t+(2260000*w850mb/1004))'<br>
> 'set t 1 20'<br>
> 'define epa=(te850mb*pow((1000/850),(287/1004)))-273.16'<br>
><br>
> 'set gxout shaded'<br>
> 'define a = thetae'<br>
> 'd a - a(t-1)'<br>
> 'cbarm'<br>
><br>
> 'printim C:\Users\123\for\temp_'i'.png x800 y600'<br>
><br>
> 'clear'<br>
><br>
> i=i+1<br>
> endwhile<br>
><br>
> return<br>
><br>
> On Sun, May 9, 2021 at 8:54 PM Jeff Duda <<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a> <br>
> <mailto:<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a>>> wrote:<br>
><br>
>     Oh, yeah...I missed that. Good catch, James!<br>
><br>
>     But the display command I suggested to him (d a - a(t-1))<br>
>     certainly is valid for plotting the 1-time-step change in thetae,<br>
>     which I presume is what he wanted originally. It depends on the<br>
>     final graphic type he is trying to produce.<br>
><br>
>     On Sun, May 9, 2021 at 10:41 AM James Potemra <<a href="mailto:jimp@hawaii.edu" target="_blank">jimp@hawaii.edu</a><br>
>     <mailto:<a href="mailto:jimp@hawaii.edu" target="_blank">jimp@hawaii.edu</a>>> wrote:<br>
><br>
>         You are not defining the time correctly.? In this new script<br>
>         you define "thetae", and this is still only defined for a<br>
>         single time-step.? You need to put the "set t 1 81" before any<br>
>         variable you want to be a function of time.? Also, your<br>
>         statement "d a-a(t-1)" doesn't make sense since "a" (if<br>
>         defined properly) will be a function of time/lat/lon.? If you<br>
>         want to plot 81 contour plots, each one as a different between<br>
>         current time and time before, you'll have to script that like<br>
>         you did in your first example.<br>
><br>
>         Jim<br>
><br>
>         On 5/8/21 12:52 PM, Evgeny Gavrilov wrote:<br>
>>         this command: 'set t 1 81' before 'define' does not solve<br>
>>         this problem<br>
>><br>
>>         On Sun, May 9, 2021 at 1:11 AM Jeff Duda<br>
>>         <<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a> <mailto:<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a>>> wrote:<br>
>><br>
>>             What do you mean by "doesn't help"? We need specifics to<br>
>>             be able to fully help you.<br>
>><br>
>>             Jeff Duda<br>
>><br>
>>             On Sat, May 8, 2021 at 1:53 PM Evgeny Gavrilov<br>
>>             <<a href="mailto:eugen420@gmail.com" target="_blank">eugen420@gmail.com</a> <mailto:<a href="mailto:eugen420@gmail.com" target="_blank">eugen420@gmail.com</a>>> wrote:<br>
>><br>
>>                 ? still doesn't help 'set t 1 81'<br>
>><br>
>>                 'reinit'<br>
>><br>
>>                 'sdfopen<br>
>>                 <a href="https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z" rel="noreferrer" target="_blank">https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z</a><br>
>>                 <<a href="https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z" rel="noreferrer" target="_blank">https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z</a>>'<br>
>><br>
>>                 'set mpdset hires'<br>
>>                 'set lon 10 30'<br>
>>                 'set lat 40 50'<br>
>><br>
>>                 'set display color white'<br>
>><br>
>>                 'set gxout shaded'<br>
>>                 'define tc = tmpprs(lev=850)'<br>
>>                 'define rh = rhprs(lev=850)'<br>
>>                 'define dewp850mb =<br>
>>                 (tc-273.15)-((14.55+0.114*(tc-273.15))*(1-0.01*rh)+pow((2.5+0.007*(tc-273.15))*(1-0.01*rh),3)+(15.9+0.117*(tc-273.15))*pow((1-0.01*rh),14))'<br>
>>                 'define vapr850mb =<br>
>>                 6.112*exp((17.67*dewp850mb)/(dewp850mb+243.5))'<br>
>>                 'define e850mb = vapr850mb*1.001+(850-100)/900*0.0034'<br>
>>                 'define w850mb = 0.62197*(e850mb/(850-e850mb))'<br>
>>                 'define te850mb = (tc+(2260000*w850mb/1004))'<br>
>>                 'define thetae =<br>
>>                 (te850mb*pow((1000/850),(287/1004)))-273.16'<br>
>><br>
>>                 'set t 1 81'<br>
>>                 'define a = thetae'<br>
>>                 'd a-a(t-1)'<br>
>>                 'cbarm'<br>
>><br>
>>                 'printim C:\Users\for\temp.png x800 y600'<br>
>><br>
>>                 'clear'<br>
>><br>
>>                 return<br>
>><br>
>>                 On Sat, May 8, 2021 at 11:15 PM Evgeny Gavrilov<br>
>>                 <<a href="mailto:eugen420@gmail.com" target="_blank">eugen420@gmail.com</a> <mailto:<a href="mailto:eugen420@gmail.com" target="_blank">eugen420@gmail.com</a>>> wrote:<br>
>><br>
>>                     still doesn't help 'set t 1 81'<br>
>><br>
>>                     'reinit'<br>
>><br>
>>                     'sdfopen<br>
>>                     <a href="https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z" rel="noreferrer" target="_blank">https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z</a><br>
>>                     <<a href="https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z" rel="noreferrer" target="_blank">https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z</a>>'<br>
>><br>
>>                     'set mpdset hires'<br>
>>                     'set lon 10 30'<br>
>>                     'set lat 40 50'<br>
>><br>
>>                     'set display color white'<br>
>><br>
>>                     'set gxout shaded'<br>
>>                     'define tc = tmpprs(lev=850)'<br>
>>                     'define rh = rhprs(lev=850)'<br>
>>                     'define dewp850mb =<br>
>>                     (tc-273.15)-((14.55+0.114*(tc-273.15))*(1-0.01*rh)+pow((2.5+0.007*(tc-273.15))*(1-0.01*rh),3)+(15.9+0.117*(tc-273.15))*pow((1-0.01*rh),14))'<br>
>>                     'define vapr850mb =<br>
>>                     6.112*exp((17.67*dewp850mb)/(dewp850mb+243.5))'<br>
>>                     'define e850mb =<br>
>>                     vapr850mb*1.001+(850-100)/900*0.0034'<br>
>>                     'define w850mb = 0.62197*(e850mb/(850-e850mb))'<br>
>>                     'define te850mb = (tc+(2260000*w850mb/1004))'<br>
>>                     'define thetae =<br>
>>                     (te850mb*pow((1000/850),(287/1004)))-273.16'<br>
>><br>
>>                     'set t 1 81'<br>
>>                     'define a = thetae'<br>
>>                     'd a-a(t-1)'<br>
>>                     'cbarm'<br>
>><br>
>>                     'printim C:\Users\for\temp.png x800 y600'<br>
>><br>
>>                     'clear'<br>
>><br>
>>                     return<br>
>><br>
>>                     On Sat, May 8, 2021 at 10:54 PM James T. Potemra<br>
>>                     <<a href="mailto:jimp@hawaii.edu" target="_blank">jimp@hawaii.edu</a> <mailto:<a href="mailto:jimp@hawaii.edu" target="_blank">jimp@hawaii.edu</a>>> wrote:<br>
>><br>
>>                         You will have to set the time range before<br>
>>                         defining variable 'a', otherwise it will only<br>
>>                         be defined for a single time step. Try add<br>
>>                         'set t 1 81' before defining 'a'.<br>
>><br>
>>                         Jim<br>
>><br>
>>                         On 5/8/21 8:42 AM, Evgeny Gavrilov wrote:<br>
>>>                         "i" from while.<br>
>>><br>
>>>                         maps = 20<br>
>>>                         ? i = 1<br>
>>>                         ? while ( i<maps )<br>
>>>                         'set t ' i<br>
>>><br>
>>>                         2) a-a(t=1) also has a report about constant<br>
>>>                         field (value=0)<br>
>>><br>
>>>                         'reinit'<br>
>>><br>
>>>                         'sdfopen<br>
>>>                         <a href="https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z" rel="noreferrer" target="_blank">https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z</a><br>
>>>                         <<a href="https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z" rel="noreferrer" target="_blank">https://nomads.ncep.noaa.gov/dods/gfs_0p25/gfs20210508/gfs_0p25_12z</a>>'<br>
>>><br>
>>>                         'set mpdset hires'<br>
>>>                         'set lon 10 30'<br>
>>>                         'set lat 40 50'<br>
>>><br>
>>>                         'set display color white'<br>
>>><br>
>>>                         'set gxout shaded'<br>
>>>                         'define a = tmp2m'<br>
>>>                         'd a-a(t-1)'<br>
>>>                         'cbarm'<br>
>>><br>
>>>                         'printim C:\Users\for\temp.png x800 y600'<br>
>>><br>
>>>                         'clear'<br>
>>><br>
>>>                         return<br>
>>><br>
>>>                         On Sat, May 8, 2021 at 10:11 PM Jeff Duda<br>
>>>                         <<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a><br>
>>>                         <mailto:<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a>>> wrote:<br>
>>><br>
>>>                             1a) How is 'i' set?<br>
>>>                             1b) I don't think the grads scripting<br>
>>>                             language supports math in a command line<br>
>>>                             command like that. You'd have to do<br>
>>>                             something like<br>
>>>                             i = 1<br>
>>>                             i2 = i-1<br>
>>>                             'd a(t='i') - a(t='i2')'<br>
>>><br>
>>>                             2) This command is equivalent and does<br>
>>>                             not require a script variable (provided<br>
>>>                             your dimension environment is set<br>
>>>                             appropriately): 'd a - a(t-1)'<br>
>>><br>
>>>                             Jeff Duda<br>
>>><br>
>>>                             On Sat, May 8, 2021 at 12:01 PM Evgeny<br>
>>>                             Gavrilov <<a href="mailto:eugen420@gmail.com" target="_blank">eugen420@gmail.com</a><br>
>>>                             <mailto:<a href="mailto:eugen420@gmail.com" target="_blank">eugen420@gmail.com</a>>> wrote:<br>
>>><br>
>>>                                 why this method does not working?<br>
>>><br>
>>>                                 'set gxout shaded'<br>
>>>                                 'define a=tmp2m'<br>
>>>                                 'd a(t='i') - a(t='i-1')'<br>
>>><br>
>>>                                 report: constant field. value = 0<br>
>>>                                 _______________________________________________<br>
>>>                                 gradsusr mailing list<br>
>>>                                 <a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><br>
>>>                                 <mailto:<a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a>><br>
>>>                                 <a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
>>>                                 <<a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a>><br>
>>><br>
>>><br>
>>><br>
>>>                             -- <br>
>>>                             Jeff Duda, Research Scientist<br>
>>>                             University of Colorado Boulder<br>
>>>                             Cooperative Institute for Research in<br>
>>>                             Environmental Sciences<br>
>>>                             NOAA/OAR/ESRL/Global Systems Laboratory<br>
>>>                             Boulder, CO<br>
>>>                             _______________________________________________<br>
>>>                             gradsusr mailing list<br>
>>>                             <a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><br>
>>>                             <mailto:<a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a>><br>
>>>                             <a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
>>>                             <<a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a>><br>
>>><br>
>>><br>
>>>                         _______________________________________________<br>
>>>                         gradsusr mailing list<br>
>>>                         <a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a>  <mailto:<a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a>><br>
>>>                         <a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a>  <<a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a>><br>
>><br>
>>                 _______________________________________________<br>
>>                 gradsusr mailing list<br>
>>                 <a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a> <mailto:<a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a>><br>
>>                 <a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
>>                 <<a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a>><br>
>><br>
>><br>
>><br>
>>             -- <br>
>>             Jeff Duda, Research Scientist<br>
>>             University of Colorado Boulder<br>
>>             Cooperative Institute for Research in Environmental Sciences<br>
>>             NOAA/OAR/ESRL/Global Systems Laboratory<br>
>>             Boulder, CO<br>
>>             _______________________________________________<br>
>>             gradsusr mailing list<br>
>>             <a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a> <mailto:<a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a>><br>
>>             <a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
>>             <<a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a>><br>
>><br>
>><br>
>>         _______________________________________________<br>
>>         gradsusr mailing list<br>
>>         <a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a>  <mailto:<a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a>><br>
>>         <a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a>  <<a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a>><br>
>         _______________________________________________<br>
>         gradsusr mailing list<br>
>         <a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a> <mailto:<a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a>><br>
>         <a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
>         <<a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a>><br>
><br>
><br>
><br>
>     -- <br>
>     Jeff Duda, Research Scientist<br>
>     University of Colorado Boulder<br>
>     Cooperative Institute for Research in Environmental Sciences<br>
>     NOAA/OAR/ESRL/Global Systems Laboratory<br>
>     Boulder, CO<br>
><br>
><br>
> _______________________________________________<br>
> gradsusr mailing list<br>
> <a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><br>
> <a href="http://gradsusr.org/mailman/listinfo/gradsusr" rel="noreferrer" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
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Subject: Digest Footer<br>
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_______________________________________________<br>
gradsusr mailing list<br>
<a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><br>
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<br>
End of gradsusr Digest, Vol 135, Issue 10<br>
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