procedure: thm_cal_fgm_dac_ffset Purpose: Uses routine provided by Dragos Constanine to correct FGM offset from non-linearity of DAC(Digital Analog Converter) Specific routine from Dragos: thm_fgm_find_shift_1p1c.pro Calibration values from Dragos: thm_fgm_dac_corrections.dat Inputs: fgmdata: An Nx3 length array of fgm data in digital units. fgmdata[*,0] = x,fgmdata[*,1] = y,fgmdata[*,2] = z probe: The probe letter, as a string. datatype: fgm data type can be (fgl,fge,fgh) Outputs: Mutates fgmdata in place. error: Set to 1 if error occurs, 0 otherwise Notes: This routine based largely upon routine fgm_correct_shift by Dragos Constantinescu $LastChangedBy: aaflores $ $LastChangedDate: 2012-02-22 11:30:33 -0800 (Wed, 22 Feb 2012) $ $LastChangedRevision: 9811 $ $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/spacecraft/fields/thm_cal_fgm_dac_offset.pro $