The readout of the SW array is an elaborated form of CID readout.
Measurements of the pixel charge is done by sensing the voltages
of the 32 output lines after sequentially injecting the pixel
charges in the substrate through column voltage gates. The analog
chain uses an adaptive filter followed by high gain preamplifiers.
The filtering scheme gives a periodic signal with 32 peaks
corresponding to the pixels intensities. The baseline is measured
before and after each injection, giving 65 measurements. The true
value of the pixel charge is provided by the difference between the
peak measurement and the mean value between the 2 adjacent
baseline measures. This scheme holds for the 32 photosensitive
lines, and also for 2 blind reference lines used for removing the
correlated pick up noise. The data are stored in a 
frame for the baseline measures, and a 
frame for
the peak measures.
This array is little affected by glitches induced by charged particles, therefore long integration times are permitted. They allow to overcome the high readout noise. In flight, the integration times allowed are: 0.28s, 2s, 6s, 20s and 60s.
Glitches can easily be removed from the observations using filtering techniques. For this purpose, it is necessary to take at least four consecutive exposures at every pointing. When the integration time is equal to 0.28 sec, as the telemetry rate only allows to send one image every second, four images are averaged on board before downlink. Therefore, it is necessary to take four times four images, for deglitching purposes so the shortest observation will last four seconds.