E.2 NGC3177

Figure E.3: HST WFPC2 PC image of NGC3177. Central part of a WFPC2 PC image of NGC3177, obtained with a 400 s exposure with the F606W filter, similar to $V$. The image side is about 16 arcsec.

Figure E.4: GAIA simulated flux map of NGC3177. 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.