Boxplot for the relative errors in lg   ρ_c, p, and M_line for the three cloud models and the three cloud distances (beam sizes of 3, 6, and 12 pixels corresponding to the near, medium, and far distances). The errors are calculated by comparing the values derived from N^Obs to those obtained from N^True (see Figs. 4, 5, and 8). For each parameter, the box extends between the first and third quartile with a horizontal line indicating the median value. The vertical lines (whiskers) extend from the box to the last data point within a distance equal to 1.5 times the distance between the third and the first quartile. Points outside this range are drawn with crosses. The number of outliers falling outside the plotted range is indicated with numbers near the upper and lower borders.