<div>Try with the following, perhaps it works.</div>
<div> </div>
<div> </div>
<div>'sdfopen <a onclick="return top.js.OpenExtLink(window,event,this)" href="http://temp.2000.nc/" target="_blank">temp.2000.nc</a>'<br>'set lon 40 200'; 'set z 1 12'; 'set lat 0'; 'set t 1'
<br>'define tave=ave(ave(temp,time=20mar,time=10jun),lat=-5,lat=5)'</div>
<div>'define lave=ave(temp, lat=-5,lat=5)'<br>'define aa=(ave(lave-tave,time=20mar,time=25mar))'<br>'d aa'</div>
<div> </div>
<div>It may estimate the band-latitude average and then the time anomaly.</div>
<div>Good luck!</div>
<div>Eduardo.</div>