There are 365 tiles having their best v3 observation at Q<5. This 
number comes from the SIT file of 020130, which is 93.5% complete.
Thus, these numbers are expected to change slightly by the time we 
reach 100% completion for v3 processing.

Roughly 90% of those 365 tiles have only one observation, and here 
are the reasons why they were downgraded --

Reason for           # of regular      # of gap
downgrade            science tiles    fill tiles   
---------------      -------------    ----------     
Sensitivity:               9             18 
Seeing shape:             28              0
Untracked seeing:        102              0
Airglow:                  43              1  
Second moment ratio:      16              0
Photometricity-
  Cloud undetected in v2:  4              0
  Bad zp soln on 971123n: 27              0  (entire night)
  Bad zp soln on 990511s:  7              0  (last sci block of night)
  2-cal soln on 981015n:   8              0
  2-cal soln on 991013s:   6              0
  2-cal soln on 991029n:   7              0
  2-cal soln on 001122n:   1              0
Overall scoring override-
  Ladybugs:               53              0
  J electronics glitches:  3              0
  Cloud undetected in v2:  1              0
                         ---            ---
Totals:                  315             19


The other 10% have multiple observations, but of course all of those 
observations have Q<5. Here is the breakdown of those --

Normal Science Tiles: 14
------------------------
Tile 7315 -- 2 observations
      Q=3 for sensitivity
      Q=1 for untracked seeing
Tile 8539 -- 2 observations
      Q=3 for sensitivity (2 times)
Tile 11481 -- 2 observations
      Q=3 for sensitivity
      Q=1 for untracked seeing
Tile 12885 -- 2 observations
      Q=3 for sensitivity
      Q=1 for untracked seeing
Tile 13074 -- 2 observations
      Q=1 for untracked seeing
      Q=1 for overall scoring downgrade for ladybug
Tile 24980 -- 5 observations
      Q=3 for sensitivity (3 times)
      Q=3 for photometricity 
      Q=2 for overall scoring downgrade for offset photometry
Tile 24981 -- 5 observations
      Q=3 for sensitivity (3 times)
      Q=3 for photometricity
      Q=2 for overall scoring downgrade for offset photometry
Tile 28773 -- 5 observations
      Q=3 for sensitivity (4 times)
      Q=2 for overall scoring downgrade for cloud undetected in v2
Tile 205412 -- 2 observations
      Q=3 for sensitivity
      Q=1 for photometricity (has cloud undetected in v2)
Tile 324509 -- 2 observations
      Q=3 for sensitivity
      Q=1 for seeing shape
Tile 326521 -- 2 observations
      Q=3 for sensitivity
      Q=1 for airglow
Tile 327571 -- 2 observations
      Q=3 for sensitivity
      Q=1 for seeing shape
Tile 328738 -- 2 observations
      Q=3 for sensitivity
      Q=3 for photometricity (highly questionable zero-point)
Tile 328859 -- 2 observations
      Q=1 for airglow (2 times)

Gap-fill Tiles: 17
------------------
Tile 89030 -- 3 observations
      Q=3 for sensitivity (3 times)
Tile 89504 -- 2 observations
      Q=3 for sensitivity
      Q=1 for untracked seeing
Tile 89505 -- 2 observations
      Q=3 for sensitivity (2 times)
Tile 89509 -- 3 observations
      Q=3 for sensitivity (3 times)
Tile 89510 -- 2 observations
      Q=3 for sensitivity (2 times)
Tile 89534 -- 2 observations
      Q=3 for sensitivity (2 times)
Tile 89535 -- 2 observations
      Q=3 for sensitivity (2 times)
Tile 89536 -- 3 observations
      Q=3 for sensitivity (3 times)
Tile 89541 -- 2 observations
      Q=3 for sensitivity
      Q=1 for untracked seeing
Tile 89616 -- 3 observations
      Q=3 for sensitivity (3 times)
Tile 89617 -- 2 observations
      Q=3 for sensitivity (2 times)
Tile 89618 -- 2 observations
      Q=3 for sensitivity (2 times)
Tile 89619 -- 2 observations
      Q=3 for sensitivity (2 times)
Tile 389007 -- 2 observations
      Q=3 for sensitivity
      Q=1 for airglow
Tile 389644 -- 3 observations
      Q=3 for sensitivity (3 times)
Tile 389645 -- 2 observations
      Q=3 for sensitivity (2 times)
Tile 389646 -- 3 observations
      Q=3 for sensitivity (3 times)