how to extract perticular levels from ctl file

[Kiran Salunke]

Dear Gradsusers,

  I have ctl file which contain Geopotential height,U,V with 26 different
level & 120hr forecast 21 points.(00,06,12,18.....................)
1000 975 950 925 900 850 800 750 700 650 600 550 500 450 400 350 300 250 200
150 100 70 50 30 20 10

from these levels i would like to extract 1000,850,700,500,300,200,100.

is there any way to do this ???/ convert it in .txt format


kindly help me !!

kiran
--------------------------------------------------------------------
dset ^zuv.dat
undef 9.999E+20
title T254_IND
*options template
ydef 161 linear -20.000000 0.5
xdef 241 linear 20.000000 0.500000
tdef 21 linear 00Z04may2009 6hr
*  z has 21 levels, for prs
zdef 21 levels
1000 975 950 925 900 850 800 750 700 650 600 550 500 450 400 350 300 250 200
150 100 70 50 30 20 10
vars 3
HGTprs 26 7,100,0 ** (profile) Geopotential height [gpm]
UGRDprs 26 33,100,0 ** (profile) u wind [m/s]
VGRDprs 26 34,100,0 ** (profile) v wind [m/s]
ENDVARS