Luminosity functions. Left: luminosity function (LF) of all detected and matched objects in the frame of PGC 087327 (in black), and in the background fields (in green, dashed). Center: LF of the GC candidates in the galaxy frame (in black), and the mean LF of GC candidates over the four background fields (in green). Right: LF of the GC candidates in PGC 087327 after subtracting the mean LF from the background fields. This luminosity function has not yet been corrected for completeness.