[gradsusr] plotting time in hovmoller pictures

[Liping Liu]

Hi,   (I am a new user of GrADs)

I am trying to plot two hovmollers into one figure. The problem is the time. 
First I plot the hovmollers using data from file 1 for Aug10 to Aug15, with the following commands:

'set yflip on'
'set lev 1000'
'set tlsupp year'
'set t 2 48'
'set lat 15'
'set gxout shaded'
'set grads off'
'd ave(olr.1,lat=5,lat=25)'

So it gives me a figure for Aug10--Aug15. But, when I repeat the plotting for another period of time Aug15-Aug20:  

'set t 49 80'
'd ave(olr.2,lat=5,lat=25)' 

It will simply overlap the whole figure, the time is not sequenced. 

Question: what do I do to get the pictures of Aug10-15 and Aug15-20 laid out vertically (not overlapping each other)? 

An alternative way is to write the two sets of data into one data file. But I don't know how to do that either. 

Thanks for your help. Suggestions to either of the approaches are greatly appreciated!

Liping
 
 		 	   		  
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