Hello All, I discovered that, when calculating RMSE, the let r = q[l=6:9@sum] !for JJAS doesnt work but only l=1:3@ave
and therefore it worked with this command
let p=pre[d=6,x=44.25E:51.75E@ave,y=2.25N:10.5S@ave,l=1:3@ave]-pr[d=2,x=44.25E:51.75E@ave,y=2.25N:10.5S@ave,l=1:3@ave]
list p
let q = p^2
list q
let s=q/3
list s
let m = s^0.5
list m
list/file=RMSE_EEA_MAM_GRELL.dat m