Luminosity function of GC candidates. Left: g-band completeness corrected luminosity function of GC candidates within R_e, GC of NGC 5018 (black dashed histogram) and for the annular background (red dashed histogram) and random background (green dashed histogram). Right: GCLF obtained after annular background subtraction (solid red histogram) and random background subtraction (solid green histogram), both fitted with Gaussian function (dashed red and green curves, respectively). The vertical dashed black line represents the expected TOM of the GCLF in this passband.