GC selection procedure. Left panel: IE image of the dwarf EDwC-0791. The green circle shows the 1.5 R_e search radius adopted to identify GC candidates around the galaxy. Middle panel: on-galaxy selection region (large central green circle) and the first inner background annulus used for background correction (red circles, 5–10 Re in size). All sources detected on the galaxy and in the background region are shown as green (on-galaxy) and red (off-galaxy) empty circles. The sources that fulfil all selection criteria adopted for identifying GC candidates are shown as filled red (green) symbols in the outer (inner) area. The blue symbols in the centre identify GC candidates within R_e/3, which are possible nuclear star clusters. Right panel: concentration index for sources on the galaxy and in the first background annulus. The symbols and colours are the same as in the middle panel. The dashed orange lines and the pale orange shaded area mark the ranges adopted for identifying GC candidates in this plane. The magenta line is the median concentration index measured on bright stars.