Column-density PDF two-component fit of Corona: the orange and blue curves correspond to a log-normal and a power-law fit to the observed PDF. The solid red curve represents the sum of the orange and blue curves (below ~0.12 mag, the red curve coincides with the orange curve). The fit of these two functions to the entire cloud produced better residuals (grey area) than for the case of a single log-normal, but a clear pattern in the residuals at lower column densities is still present.