Integrated intensity ratios N2H+(3−2)/CS(6−5) and N2H+(3−2)/H2CO(42,2–32,1) plotted versus a) the evolutionary sequence of the six W33 source; b) their bolometric luminosities; c) their total masses; d) their bolometric luminosity to total mass ratio Lbol/M, and e) their H2 peak column densities. The latter ratio is divided by 10 to be plotted in the same range as the former ratio.
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