dset /clima_nfs/oper/nmme5/grads/AOT.gdat 
undef -999. 
title eta model 
xdef 285 linear -25.0 0.33333 
ydef 181 linear 0.0 0.33333 
tdef 25 linear 00Z30jun2014 03hr 
zdef 1 levels 1 
vars 2 
aot    0  920,1,0              AOT 
sfcdc   0  919,1,0              AOT 
endvars