Log(N) versus central surface brightness μ for F140W. The dashed line is a linear fit for 20 < μ < 23.25 (small dots). At μ ≥ 23.5, the histogram declines below the dashed line due to incompleteness. The completeness fractions are calculated as f_c = 10^data/10^fit for three values of μ as labeled and marked with the dotted vertical lines and open circles at the intersection with the dashed line.