E.1 M100

Figure E.1: HST WFPC2 PC image of M100. Central part of a WFPC2 PC image of M100, obtained with a 900 s exposure with the F555W filter, similar to $V$. The image side is about 16 arcsec.

Figure E.2: GAIA simulated flux map of M100. BBP flux map reconstructed from 50 simulated observations, i.e. with an effective total exposure time of 43.09 s, obtained with $6\times4$ pixels/sample. The side of the flux map is about 16 arcsec.