Loop

[Isha Renta]

GrADS Users:

I am trying to plot  loop for the .ctl file that I have. My data is in
grib format. I ran grib2ctl.pl to get the .ctl file. I also changed the
tdef of all the .ctl files  to

tdef 22 linear 12Z29sep2002 6hr

I then ran gribmap for all the .ctl. I can view output for a each level
in dependently but if I try to make a loop, "set t 1 5", I first get
the "t 1" plot and for the "t 2,3,4, and 5" I get the "Cannot contour
grid - all undefined values" and the "Entire grid undefined"  on the
plot window. Even if I just try to plot "set t 2" I get the "Cannot
contour grid - all undefined values" message in the terminal window and
the "Entire grid undefined"  on the plot window. I don't know what can
cause this.The .ctl file looks like this:

dset ^lili13l.2002092912.gribn2.f06
index ^lili13l.2002092912.gribn2.f06.idx
undef 9.999E+20
title lili13l.2002092912.gribn2.f06
*  produced by grib2ctl v0.9.12.5p33k
dtype grib 255
ydef 66 linear 13.583000 0.167
xdef 66 linear -82.916000 0.167000
tdef 22 linear 12Z29sep2002 6hr
zdef 20 levels
1000 950 900 850 800 750 700 650 600 550 500 450 400 350 300 250 200
150 100 50
vars 10
APCPsfc  0 61,1,0  ** surface Total precipitation [kg/m^2]
HGTprs 20 7,100,0 ** Geopotential height [gpm]
PRMSLmsl  0 2,102,0  ** Pressure reduced to MSL [Pa]
RHprs 20 52,100,0 ** Relative humidity [%]
TMPsfc  0 11,1,0  ** surface Temp. [K]
TMPprs 20 11,100,0 ** Temp. [K]
UGRDprs 20 33,100,0 ** u wind [m/s]
UGRDhag  0 33,105,35  ** u wind [m/s]
VGRDprs 20 34,100,0 ** v wind [m/s]
VGRDhag  0 34,105,35  ** v wind [m/s]
ENDVARS

Does anyone know how could I solve this?

Thanks for help,
Isha