1) boss_survey.ply/fits
  This simple mask provides a broad outline of the survey geometry.  It is the same for DR10/DR11/DR12.  Objects outside this mask are vetoed.

2) boss_geometry_2014_05_28.ply/fits
  This mask provides the full geometric structure of the BOSS spectroscopic tiles for DR12.  Objects outside this mask are vetoed.

3) badfield_mask_postprocess_pixs8.ply
  Objects inside this mask are vetoed.  Same for DR11 and DR12.

4) badfield_mask_unphot_seeing_extinction_pixs8_dr12.ply
  Objects inside this mask are vetoed.  This is an update of badfield_mask_unphot-ugriz_pix.ply created for DR12, which includes new seeing and extinction cuts.

5) allsky_bright_star_mask_pix.ply
  Objects inside this mask are vetoed.  Same for DR10, DR11, DR12.

6) bright_object_mask_rykoff_pix.ply
  Objects inside this mask are vetoed.  Same for DR10, DR11, DR12.

7) collision_priority_mask_dr12.ply
  Objects inside this mask are vetoed.  New version in DR12.  Excludes 62'' area around highest priority quasars (they take priority over galaxy targets).

8) centerpost_mask_dr12.ply
  Objects inside this mask are vetoed.  New version in DR12.  Objects cannot be observed directly behind the centerpost of the spectroscopic plate.