YSCC total infrared luminosity and bolometric-to-Hα luminosity ratio are plotted as a function of the MIR-source bolometric luminosity. In the lower and upper left panels we show sources associated with GMCs, in the lower and upper right panels we show sources not associated with GMCs. Blue circles are embedded b-type sources; red squares are YSCCs of c1-type; green stars are YSCCs of c2-type; cyan filled triangles are unclassifiable sources with GMCs; magenta triangles are YSCCs without GMCs; black crosses are sources of unknown nature without GMCs (e-type). Continuous lines of unity slope in all four panels are not fits to the data, but are drawn for reference.