Illustration of the readout windows. For the brightest source (big blue star) Gaia assigns the full window (blue grid) of 12 × 12 pixels. When a second source is within this window (e.g. red star) we assume that this star is not observed by Gaia. If the brightness of both stars is similar (ΔG < 1 mag) we also neglect the brighter source. For a second source close by but outside of the readout window (e.g. grey star) Gaia assigns a truncated readout window (green grid). We assume that this star can be observed, and the precision along the scan direction is the same as for the full readout window. For more distant sources (e.g. yellow star) Gaia assigns a full window.
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