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What does this error message mean



Hi, I am trying to do t_test with ferret. I do that using new model data with observation Data and old model data with observation data. But I failed
When I do that using new model data and old model data I succeeded. I wonder why it doesn't work now. Can any experinced user give me some hints? Thanks in advance the following is the script and the error message when I ran it




yes? go test.jnl 200
USE mm5_lon180.ctrl.nc
USE indwp_control.nc
use daily_reanal
!use rean_daily_tropics_90.nc
let n1=792
let n2=731
let n=730
let var1=UNEW[d=1,x=47.5E:177.5E,y=22.5N:22.5S,z=$1,T=@var]
!-> DEFINE VARIABLE var1=UNEW[d=1,x=47.5E:177.5E,y=22.5N:22.5S,z=200,T=@var]
let var2=U[d=2,x=47.5E:177.5E,y=22.5N:22.5S,z=$1,T=@var]
!-> DEFINE VARIABLE var2=U[d=2,x=47.5E:177.5E,y=22.5N:22.5S,z=200,T=@var]
let var0=u[d=3,x=47.5E:177.5E,y=22.5N:22.5S,z=$1,T=@var]
!-> DEFINE VARIABLE var0=u[d=3,x=47.5E:177.5E,y=22.5N:22.5S,z=200,T=@var]
define axis/t=1:1:1 time1
Replacing definition of axis TIME1
*** NOTE: grid used by data set daily_reanal
*** NOTE: Redefinition may alter apparent contents of data set
let var1_0=reshape(var1,t[gt=time1])
let var2_0=reshape(var2,t[gt=time1])
let var0_0=reshape(var0,t[gt=time1])

let t1=UNEW[d=1,x=47.5E:177.5E,y=22.5N:22.5S,z=$1,l=1:792@ave]
!-> DEFINE VARIABLE t1=UNEW[d=1,x=47.5E:177.5E,y=22.5N:22.5S,z=200,l=1:792@ave]
let t2=U[d=2,x=47.5E:177.5E,y=22.5N:22.5S,z=$1,l=1:731@ave]
!-> DEFINE VARIABLE t2=U[d=2,x=47.5E:177.5E,y=22.5N:22.5S,z=200,l=1:731@ave]
let to=u[d=3,x=47.5E:177.5E,y=22.5N:22.5S,z=$1,l=1:730@ave]
!-> DEFINE VARIABLE to=u[d=3,x=47.5E:177.5E,y=22.5N:22.5S,z=200,l=1:730@ave]
let se1=(var1_0/n1+var0_0/n)^0.5
let tt1=(t1-to)/se1
let se2=(var2_0/n2+var0_0/n)^0.5
let tt2=(t2-to)/se2


FILL/X=47.5E:177.5E/Y=22.50S:22.50N tt1
**ERROR: illegal limits: T1 is not in the range T=01-JUN-1990 00:00
Axis extremes are T=01-JUN-1990 00:00
CONTOUR/FILL/X=47.5E:177.5E/Y=22.50S:22.50N tt1
Command file, command group, or REPEAT execution aborted
********************************
However when I tried to plot se1, the error message is the following. It is really strange
FILL/X=47.5E:177.5E/Y=22.50S:22.50N se1
**ERROR: dimensions improperly specified: must be a 2D region
CONTOUR/FILL/X=47.5E:177.5E/Y=22.50S:22.50N se1
CONTOUR/FILL/X=47.5E:177.5E/Y=22.50S:22.50N se1
Command file, command group, or REPEAT execution aborted

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