Gaia Data Release 2
Free Access

Fig. 6


Offset relative to prescan in RVS3 (strip 17) in row 5 of the Gaia focal plane array as measured using special sequences during a calibration run in September 2016. The time axis range is just under 1 ms and represents one TDI line in which only 72 samples can be sampled in RVS modes, but we show many samples from different read patterns on different TDI lines for illustrative purposes. The time axis is labelled in units of master clock cycles (Tmc) where one clock cycle lasts 50 ns. The three empty regions correspond to the second, third, and fourth readout pauses associated with the respective phase clock swings in the four-phase Gaia CCDs described earlier in the main text. The first of these clock swings is not observed because it takes place before the prescan samples and hence prior to image section sampling.

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