How to run this program "gravity anomaly or gravity in GRS80"?

Abd-Elrahim Ruby @Abd_Elrahim_Ruby

08 August 2015 0 4K Report

This program used for computes the gravity anomaly or gravity in GRS80

programmed 1999-01-28, last change 1999-05-17 by Tscherning

see attached to Download program (programs in FORTRAN77)

i would like run computation mode = 2

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