problem with my script

[du hui <bjduhui@xxxxxxxxxxx>]

Hi, the following problem confused me 
I can plot "var1/n1", "var2/n2" and "var/n" , but when I tried to plot 
"var1/n1+var2/n2" it did not work. 
Can anyone give me some hints?
Thanks a lot. 
The followint is the script and the error message
  
go com.ttest.u200.jnl
USE mm5_lon180.ctrl.nc
USE indwp_control.nc
use daily_reanal
let n1=792
let n2=731
let n=730
let var1=UNEW[d=1,k=5,T=@var]
let var2=U[d=2,k=5,T=@var]
let var=u[d=3,k=10,T=@var]
let t1=UNEW[d=1,k=5,l=1:792@ave]
let t2=U[d=2,k=5,l=1:731@ave]
let to=u[d=3,k=10,l=1:730@ave]
let se1=(var1/n1+var/n)^0.5
let tt1=(t1-to)/se1
let se2=(var2/n2+var/n)^0.5
let tt2=(t2-to)/se2

FILL/X=47.5E:177.5E/Y=22.50S:22.50N (var1/n1+var/n)^0.5
*** NOTE: Ambiguous coordinates on X axis: (VAR1/N1+VAR/N)^0.5
**ERROR: illegal limits: VAR is not in the range T=31-DEC-4134 
00:00:15-JAN-4187 00:00
         Axis extremes are T=31-DEC-1989 12:00:31-DEC-1991 12:00
CONTOUR/FILL/X=47.5E:177.5E/Y=22.50S:22.50N (var1/n1+var/n)^0.5
Command file, command group, or REPEAT execution aborted

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