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Ground-motion types are hard-coded into the program. A variable named gmDict includes the column number of the ground-motion types in the GMF as its values and the ground-motion types as its keys.

For example, the ground-motion field for Attica has the format of lon,lat,PGA,SA(0.3),SA(0.6),SA(1)
Thus gmDict = {"PGA": 2, "SA(0.3)": 3, "SA(0.6)": 4, "SA(1)": 5}

But the program should automatically create gmDict, because it will not remain the same for all ground-motion fields in the future.