The mask density software is a modification of the TIDE processing software.
It calculates the moments of the sun pulse.  For stops, the moments are 
calculated using a 64 spin average beginning 30 seconds after the start of a 
background check.  For hydrogen, the moments are calculated using a 32 spin 
average beginning 6 minutes after background check commanding starts.


For the large sun pulse, the moments calculation ranges are:

     energy: 42.10 - 373.0 eV
 spin angle: 191.25 - 247.5 deg
polar angle: 0.0 - 157.5 deg


For the small sun pulse, the moments calculation ranges are:

     energy: 0.0 - 373.0 eV
 spin angle: 247.5 - 360.0 deg
polar angle: 0.0 - 157.5 deg


mask_moments_all.dat and mask_moments_sm_all.dat contain the moments for all
the Stops background checks. mask_mom_h.dat contains the moments for hydrogen.
A plot of a mask from the middle of each month for Stops are in 
http://satyr.msfc.nasa.gov/tideteam/masks/mask_plots