Bolometric luminosity (L_bol) as a function of Lyman continuum photon flux of 6 cm radio continuum emission integrated over the beam of the 3 mm observations. The colors indicate dust temperatures in the molecular clumps. The blue line shows the result of a fit to the datapoints using BCES bisector fitting. The purple squares superposed on the circles are particular sources with two Gaussian component RRLs (see Table 6 and Sect. 6). The red dotted line and red stars indicate bolometric luminosity and Lyman continuum photon flux corresponding to each spectral type (O4 − B0.5) for ZAMS stars from Panagia (1973).