linear interpolation functions in grads-2.0.a5.oga.5

[climate karsaz]

HI
 I WORKING IN LATITUDE 0 80
ALSO LONGETUDE 0  120
ALSO LEVEL 1000 925 850 700 600 500 400 300 200 100
COMPUTATION JETSTREAM IN LEVEL 250 300 400 500
CAN HELP MI PLS. THANKS. BY
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