Colour (I_E, Y_E, H_E) images of two objects of interest. As they overlap with the galaxies with which they are associated, obtaining these images required new cutouts (13.38 kpc × 13.38 kpc or 150″ × 150″), the use of MTObjects to mask sources, and the use of the GALFIT software (Peng et al. 2002) to determine and correct a tilted plane background. Finally, the colour image has been obtained with the Aladin software. Left: External star-forming region (possibly belonging to a satellite dwarf irregular galaxy) at the north of NGC 1553, labelled as (b) in Fig. 12. Right: Faint dwarf satellite galaxy at the north-west of NGC 1549, labelled as (a) in Fig. 12. In this figure, north is up, east is to the left.