Distributions of the simulated observed-frame coming from foreground sources for the total sample of 201 galaxies imposing U_max = 26 (blue histogram) and U_max = 25 (magenta histogram). The continuum vertical lines are the medians of the two distributions and the dashed and dotted lines correspond to the 1σ and 2σ confidence intervals. The symbol in the figure is the average observed-frame obtained forthe total sample.