Probability p of finding at least one GC with a g-band magnitude less or equal to the UCD’s magnitude versus the number of GCs (N_GC ) that are drawn from FCC 47’s GCLF. For each N_GC, 10 000 mock GC systems are drawn from the GCLF to compute the probability. The dotted lines indicate the number of GC candidates from the catalogue of Jordán et al. (2015) that have pGC parameters larger than 0, 0.5, and 0.95, respectively.