The cumulative mass function of cores more massive than 1 M_⊙. The total distribution of all cores is shown in blue solid line; the distribution of 24 μm-bright cores is shown in the red dash-dotted line; the distribution of 24 μm-dark cores is shown in black dashed line. A simple linear regression was fit to each distribution, taking the functional form N(>M) ∝ M^α. For reference, on this scale, a Salpeter slope is α = 1.35.