The fringe correction for y band is sometimes incorrect. I generated some histograms to see which chips are affected and how bad it is. I selected fringe_0 out of the database for y band images taken between 2010-12-01 and 2011-01-06. The following histogram is generated, with a log scale for the y axis and the x range restricted between 0 and 25. Sometimes fringe_0 was greater than 25, but including these in the histogram is not necessary to find out which chips are having problems with the fringe correction. Also, sometimes fringe_0 is set to NULL, and this occurs throughout the exposure, and these are ignored in the histogram as well. Finally, fringe_0 is always greater than 0 (for the dates I selected).

Some statistics on these:

class_id  median       mean         std dev      max        % with fringe_0 > 25
XY01      2.14685      2.78547      4.55052      134.874    0.0050847458
XY02      1.90675      2.44930      3.30728      63.0371    0.0045197740
XY03      2.76987      3.16849      1.91553      9.21880       0.0000000
XY04      2.02275      2.33695      2.32076      49.4671    0.0016949153
XY05      3.13525      3.46483      2.04380      34.6189    0.0022598870
XY06      5.86210      10.0423      21.1350      434.895     0.057627119
XY10     0.677878      1.14464      3.08411      82.6363    0.0033898305
XY11      2.57013      6.28285      11.6783      137.289     0.057062147
XY12      3.00225      4.25366      5.80556      66.3143     0.019209040
XY13      1.94048      2.83383      2.43898      9.84651       0.0000000
XY14      2.21751      2.31153     0.993812      7.84043       0.0000000
XY15      2.28722      2.36665      1.18602      14.0283       0.0000000
XY16      2.07397      2.92317      3.16791      58.5429    0.0039548023
XY17      3.55830      3.72393      1.25008      14.7710       0.0000000
XY20      1.34027      1.94968      2.23508      26.3953   0.00056497175
XY21      1.17908      1.56776      1.90712      35.3519    0.0011299435
XY22      1.47172      1.94487      3.64130      77.0823    0.0050847458
XY23      2.04026      3.15016      5.45036      85.0191     0.013559322
XY24      1.54393      1.68979      1.16973      6.29423       0.0000000
XY25      2.59187      2.72328      1.58881      7.82525       0.0000000
XY26      3.04384      3.68780      2.90791      52.1210    0.0016949153
XY27      1.81973      2.02829     0.813432      5.58368       0.0000000
XY30      2.39169      2.61380      1.45733      7.22517       0.0000000
XY31      2.86647      2.88102      1.73739      8.81901       0.0000000
XY32      1.83408      1.94064      1.18047      5.73956       0.0000000
XY33      1.67190      2.28353      4.49014      89.4411    0.0062146893
XY34      3.12894      3.46197      2.33657      11.1898       0.0000000
XY35      1.80555      2.25230      6.50881      254.001    0.0039548023
XY36      2.84232      3.08421      1.42734      8.89238       0.0000000
XY37     0.859465      1.14786      2.13926      54.3340    0.0011299435
XY40      5.47964      6.47672      4.12596      25.5146   0.00056497175
XY41      2.56550      2.83409      1.82204      34.9952   0.00056497175
XY42      2.49680      3.12582      5.62217      160.458    0.0050847458
XY43      2.03507      3.13958      5.58449      93.9078     0.011299435
XY44      1.54408      2.54833      3.12548      42.5154    0.0022598870
XY45     0.761591      1.73194      4.10712      62.5078    0.0079096045
XY46      1.84257      1.90943     0.974248      5.44862       0.0000000
XY47      5.53168      5.39727      1.18334      17.9660       0.0000000
XY50      2.16463      2.30645      1.31419      24.7577       0.0000000
XY51      3.45145      3.55691      1.72335      11.2816       0.0000000
XY52      2.27381      2.58365      1.90288      30.8967    0.0011299435
XY53      2.90160      3.46480      4.14966      90.5600    0.0056497175
XY54     0.984611      2.45462      2.70216      10.0134       0.0000000
XY55      2.38354      2.76181      2.05740      9.75831       0.0000000
XY56      1.81071      2.10362      1.52538      6.46066       0.0000000
XY57      1.67930      2.15787      4.02968      80.3189    0.0062146893
XY60     0.633743      1.08325      2.23260      58.9078   0.00056497175
XY61      1.52215      1.94917      3.28787      77.2115    0.0039548023
XY62      3.02908      3.13417      1.51751      9.64185       0.0000000
XY63      2.90316      3.38848      2.25855      40.3953   0.00056497175
XY64      2.43692      2.48120     0.879243      24.8380       0.0000000
XY65      3.91057      4.07438      1.73766      15.8247       0.0000000
XY66      1.83352      2.09043      2.06863      47.8089    0.0016949153
XY67     0.905146      1.06043      1.30531      29.0253   0.00056497175
XY71      1.27569      1.52650      1.45031      26.5018   0.00056497175
XY72      1.86214      2.16910      2.56055      64.8669    0.0028248588
XY73      6.01751      5.97639      1.87677      14.4008       0.0000000
XY74      2.83021      3.66762      4.25364      91.4215    0.0079096045
XY75      2.66233      2.71831     0.978458      21.3003       0.0000000
XY76     0.918665     0.981566     0.477278      3.72698       0.0000000

An example of an exposure where things explode:

select exp_name, class_id, fringe_0, fringe_1, fringe_2 from rawExp join chipRun using(exp_id) join chipProcessedImfile using (chip_id) where filter = 'y.00000' and exp_name ="o5562g0127o" ; 
+-------------+----------+----------+----------+----------+
| exp_name    | class_id | fringe_0 | fringe_1 | fringe_2 |
+-------------+----------+----------+----------+----------+
| o5562g0127o | XY01     |  2.89989 |  1.73069 |        0 | 
| o5562g0127o | XY02     |    14.56 |  3.56425 |        0 | 
| o5562g0127o | XY03     |  2.84405 | 0.372487 |        0 | 
| o5562g0127o | XY04     |  2.19512 | 0.206826 |        0 | 
| o5562g0127o | XY05     |  3.92425 | 0.603826 |        0 | 
| o5562g0127o | XY06     |  7.02395 |  4.09365 |        0 | 
| o5562g0127o | XY10     | 0.968364 | 0.676746 |        0 | 
| o5562g0127o | XY11     |  6.19634 |   1.9363 |        0 | 
| o5562g0127o | XY12     |  3.39375 | 0.281118 |        0 | 
| o5562g0127o | XY13     |  2.23806 |  0.28201 |        0 | 
| o5562g0127o | XY14     |  3.21626 | 0.466184 |        0 | 
| o5562g0127o | XY15     |  3.22006 | 0.427613 |        0 | 
| o5562g0127o | XY16     |   7.3712 | 0.533297 |        0 | 
| o5562g0127o | XY17     |  4.95411 |  1.24659 |        0 | 
| o5562g0127o | XY20     |  1.49795 |  0.27659 |        0 | 
| o5562g0127o | XY21     |  1.96783 | 0.363736 |        0 | 
| o5562g0127o | XY22     |    2.053 | 0.310085 |        0 | 
| o5562g0127o | XY23     |  50.7438 |  29.1275 |        0 | 
| o5562g0127o | XY24     |  1.60155 | 0.061001 |        0 | 
| o5562g0127o | XY25     |  2.48234 | 0.024439 |        0 | 
| o5562g0127o | XY26     |  4.41207 | 0.174691 |        0 | 
| o5562g0127o | XY27     |  2.19813 | 0.556806 |        0 | 
| o5562g0127o | XY30     |  2.37545 |  0.23392 |        0 | 
| o5562g0127o | XY31     |  3.12675 | 0.045992 |        0 | 
| o5562g0127o | XY32     |  2.11341 | 0.353222 |        0 | 
| o5562g0127o | XY33     |  1.96237 | 0.181551 |        0 | 
| o5562g0127o | XY34     |  3.43797 |  2.31409 |        0 | 
| o5562g0127o | XY35     |  1.14019 | 0.260336 |        0 | 
| o5562g0127o | XY36     |   3.5544 | 0.210973 |        0 | 
| o5562g0127o | XY37     |  1.43281 | 0.059052 |        0 | 
| o5562g0127o | XY40     |   8.1172 |  3.78008 |        0 | 
| o5562g0127o | XY41     |  3.78775 | 0.398204 |        0 | 
| o5562g0127o | XY42     |   3.1402 | 0.666876 |        0 | 
| o5562g0127o | XY43     |  2.67856 | 0.111939 |        0 | 
| o5562g0127o | XY44     |  2.21637 | 0.309348 |        0 | 
| o5562g0127o | XY45     |  1.66679 | 0.079452 |        0 | 
| o5562g0127o | XY46     |  1.80905 | 0.060166 |        0 | 
| o5562g0127o | XY47     |  6.31662 |  1.83607 |        0 | 
| o5562g0127o | XY50     |  2.89176 | 0.671724 |        0 | 
| o5562g0127o | XY51     |  2.99941 | 0.296205 |        0 | 
| o5562g0127o | XY52     |  1.78046 |  1.99846 |        0 | 
| o5562g0127o | XY53     |   5.4713 | 0.396272 |        0 | 
| o5562g0127o | XY54     |  7.84851 | 0.787676 |        0 | 
| o5562g0127o | XY55     |  2.33387 | 0.056494 |        0 | 
| o5562g0127o | XY56     |  1.03215 | 0.967722 |        0 | 
| o5562g0127o | XY57     |  1.77904 | 0.182634 |        0 | 
| o5562g0127o | XY60     | 0.925654 | 0.700109 |        0 | 
| o5562g0127o | XY61     |  2.52718 | 0.513826 |        0 | 
| o5562g0127o | XY62     |  5.37332 | 0.317587 |        0 | 
| o5562g0127o | XY63     |  2.97252 | 0.216043 |        0 | 
| o5562g0127o | XY64     |  3.26208 |  1.44433 |        0 | 
| o5562g0127o | XY65     |  4.76977 | 0.224413 |        0 | 
| o5562g0127o | XY66     |  1.57893 | 0.074323 |        0 | 
| o5562g0127o | XY67     |  1.55014 |  1.05426 |        0 | 
| o5562g0127o | XY71     |  1.66548 | 0.751917 |        0 | 
| o5562g0127o | XY72     |  2.17629 | 0.713648 |        0 | 
| o5562g0127o | XY73     |  7.34344 |  3.12153 |        0 | 
| o5562g0127o | XY74     |  8.77662 |  7.10027 |        0 | 
| o5562g0127o | XY75     |  3.15082 |  1.04803 |        0 | 
| o5562g0127o | XY76     |  1.44667 | 0.463873 |        0 | 
+-------------+----------+----------+----------+----------+

In this exposure, XY23 exploded, and does not have a good fit for the fringe.

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