Area normalised, extinction corrected histograms of point sources from the NGC 3585 (top) and NGC 5812 (bottom) fields. The blue dotted histograms are all sources with radii  <400″ for NGC 3585 and radii  <200″ for NGC 5812, i.e. all sources at radii with point source counts higher than the background (see Fig. 9). The red dashed histograms show normalised counts for all sources with radii  >540″ for NGC 3585 and radii  >400″ for NGC 5812, ensuring that point source counts have dropped to the background level. The solid black histogram shows the inner counts minus the background. Double Gaussian fits to the two main peaks are shown as solid black curves, and the red dotted curves are the individual Gaussian components. The double Gaussian peaks are at (C − R) ~ 1.37 (σ ~ 0.28) and (C − R) ~ 1.91 (σ ~ 0.14) for NGC 3585 and (C − R) ~ 1.30 (σ ~ 0.18) and (C − R) ~ 1.68 (σ ~ 0.07) for NGC 5812. Bin widths are 0.17 mag for NGC 3585 and 0.11 mag for NGC 5812.