Fig. 8
Column density of C18O vs. the peak fluxdensity ratio of the bandwidth of 70 and 250 μm of the protostellar (red triangles) and prestellar (black triangles) cores selected from Könyves et al. (2015). The dotted line indicates the dividing line between prestellar and protostellar cores and shows the gradual change of the ratio.
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