Table 5: Results of dust continuum single-component fit, with $\beta $ fixed at 1.5, and $\Omega $ is $1.5\times 10^{-7}$ sr.
Position $\tau_{\rm v}$ $A_{\rm v}$(ISO) $^{{\rm {\it a}}}$ N(H2) Mass $T_{\rm dust}$ $I_{\rm IR}$ $^{{\rm {\it b}}}$ L
      [1022 cm-2] [$M_\odot$(D/1.7 kpc)2] [K] [erg s-1 cm-2 sr-1] [ $10^3~L_\odot$(D/1.7 kpc)2]
DR21 E 20 $21.2\pm1.9$ 2.1 148 $41.6\pm0.6$ $0.55 \pm0.05$ 7
DR21 C 112 $121 \pm11$ 12.1 850 $42.5\pm0.7$ $3.4 \pm0.3 $ 45
DR21 W 34 $36.9\pm3.5$ 3.69 259 $30.7\pm0.4$ $0.18\pm0.02$ 2
DR21 (OH) 238 $259\pm43$ 25.8 1814 $31.2\pm0.8$ $1.3 \pm0.2 $ 17
DR21 FIR1 45 $48.4\pm4.3$ 4.84 340 $33.3\pm0.5$ $0.37\pm0.03$ 5
$^{{\rm {\it a}}}$The extinction and the opacity are linked through $A_{\rm v}=2.5 \tau_{\rm v}\cdot\log_{10}e\approx 1.085\cdot\tau_{\rm v}$.
$^{{\rm {\it b}}}$The total infrared flux is calculated from $I_{\rm IR}=\int F_\lambda {\rm d}\lambda$.

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