calc_relative.py filename
Overview Computes relative values of gravity. Assumes that the first record is to be used as the reference value (e.g. relative gravity of 0.0). Only changes the gravity value.
Assumes data file in correct format: "date sid G S"; actually, any 4 column format with the gravity as the 3rd column will work. This format is the format used by generate_table and such for time series analysis.