Instrument: FGM
Data Level: L2
Notes Author: Kenneth Bromund


version X=5:  * Y-version number comes from cal file entries. 
              * Ensures there are 2 ephemeris points before/after data to enable proper spline.  
              * Fix to depend_0 of rdeltahalf:  fixes bug when reading position data.
              * L-vector for DMPA2GSE transformation is smoothed with a gaussian filter, instead 
                of using a single average value for the day.  This short-term filter avoids  
                introduding artificial jumps at 00:00 UTC and removes 7-minute 'wobble' after  
                maneuvers in the GSE result.   
              * Fixes error with DEFATT file selection found when choosing the 
                daily DEFATT files to be used in Phase 2.
              * Fixed bug where reference Etemp was used for high range gain.  Now uses measured Etemp.
version X=4:  First version for public release of L2.
              Renamed variables to conform with new MMS variable name guidelines 
              (obs_instr_paramName[_coordSys]_mode_level):  
                Mag field parameters include 'b' for paramName.  
                Use 'r' instead of 'pos' for S/C position paramName.  
                Eliminated 'rate', replaced with 'bdeltahalf'.  Added 'rdeltahalf'.
                l1a_mode is now just 'mode'.
version X=3:  fixed removal of overlap between modes.
              fixed a bug that caused stemp and etemp to be empty.
version X=2:  flag parameter name corrected: was 'status'
                        added bits 4, 5, 6 to flag saturation on B1, B2, and B3, respectively
                        added bit 7 to flag bad data at range changes
              Added etemp and l1a_mode parameters.  
              rate, hirange, and stemp parameters now comply with MMS CDF Guidlelines, e.g.
              FILLVAL now defined for stemp and etemp, and is set to !values.f_nan
              No longer use Var_Parents attribute in stemp -- see Parents instead
              In this version, temperature-corrected gains are applied.  Reference temperatures are used when 
              stemp or etemp are set to FILLVAL. 
              Non-linearity correction is applied to high rage DFG data.
version X=1:  added 'flag', rate and hirange parameters (but 'flag' is actually called 'status')"