Crosstalk between amplifiers: [All data prior to 2009-05-07, i.e. all periods prior to, plus part of P83] Crosstalk between the amplifiers of the chips produces a series of 'crater-like' artifacts arrayed horizontally with respect to each 'bright' star in the field.
By adjusting certain voltages of the detector electronics this effect has been virtually eliminated. In addition this change reduced the Readout Noise of the detectors, but increased the minimum-DIT from 1.2572sec to 1.6762sec. This change was applied at approximately 2009-05-07T21:30.