Comparison of the two distributions of the simulated observed-frame coming from foreground sources for the total sample (201 slits per simulation) using two different slits dimensions (1 × 2 arcsec2, magenta histogram, and 1 × 2.4 arcsec2, blue histogram) and fixing Umax = 25. The continuum vertical lines are the medians of the two distributions, the dashed lines correspond to the 1σ confidence intervals while the dotted lines to the 2σ confidence intervals. The symbol in the figure is the average observed-frame obtained forthe total sample.
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