The cumulative luminosity functions of: a) the 24 μm sources (915), b) the 8 μm sources (833) shown as a function of L_TIR, c) the selected YSCs (648) as a function of L_bol and d) the selected YSCs (648), as a function of the 24 μm flux. Filled and open circles represent counts in the inner and outer regions, respectively. Linear fits for different flux ranges are shown as solid lines for the inner sample, and dashed for the outer one.