Table 6: C I and 13CO line ratio R (in ${\rm K}~{\rm km}~{\rm s}^{-1}$; values taken from Table 3), excitation temperature (with lower and upper $1\sigma $ limits), and C I, 13CO (with relative upper and lower errors), and C18O column densities (bracketed by $T_{\rm ex}$ of 13CO). All abundances X are relative to the H2 column densities (first row; taken from Col. 4 of Table 5).
Line/lineratio Source property DR21 E DR21 C DR21 W DR21 (OH) DR21 FIR1
H $_{\rm 2, dust}$ N(H2) [1022 cm-2] 2.1 12.1 3.69 25.8 4.84
C I $R_{\rm C {\sc i}{}}$ (C I 2-1/1-0) $1.29\pm 0.36$ $1.25\pm 0.35$ $1.06\pm 0.30$ $0.77 \pm 0.22$ $ 0.99\pm 0.28$
  $T_{\rm ex,[C {\sc i}]}$ [K] $\rm 79_{47}^{157}$ $\rm 74_{50}^{140}$ $\rm 56_{41}^{88}$ $\rm 38_{31}^{51}$ $\rm 51_{39}^{76}$
  N(C I) [1017 cm-2] $\rm 3.2_{-0.2}^{+0.3}$ $\rm 6.8_{-0.4}^{+0.6}$ $\rm 3.8_{-0.2}^{+0.3}$ $\rm 5.2_{-0.1}^{+0.2}$ $\rm 4.6_{-0.2}^{+0.3}$
  X(C I) [10-5] 1.5 0.56 1.03 0.20 0.10
13CO 6-5/3-2 $R_{^{13}{\rm CO,high}}$ (13CO 6-5/3-2) $0.62\pm0.26$ $0.72\pm0.31$ $0.71\pm0.30$ $0.27\pm0.12$ $0.42\pm0.18$
  $T_{{\rm ex},^{13}{\rm CO,high}}$ [K] $\rm 43^{53}_{36}$ $\rm 46^{58}_{38}$ $\rm 46^{58}_{38}$ $\rm 30^{34}_{26}$ $\rm 35^{41}_{30}$
  N(13CO 6-5) [1015 cm-2] $\rm 33.0_{+11.1}^{-9.0}$ $\rm 53.8_{+20.4}^{-12.8}$ $\rm 22.6_{+8.5}^{-5.4}$ $\rm 39.6_{+21.3}^{-10.7}$ $\rm 27.9_{+13.4}^{-7.2}$
13CO 3-2/1-0 $R_{^{13}{\rm CO,low}}$ (13CO 3-2/1-0) $3.10\pm1.30$ $1.59\pm0.67$ $1.16\pm0.49$ $1.35.\pm0.57$ $1.04\pm0.44$
  $T_{{\rm ex},^{13}{\rm CO,low}}$ [K] $\rm 25^{37}_{16}$ $\rm 15^{19}_{12}$ $\rm 13^{16}_{10}$ $\rm 14^{17}_{11}$ $\rm 12^{15}_{10}$
  N(13CO 1-0) [1015 cm-2] $\rm 33.4_{-8.9}^{+12.3}$ $\rm 75.6_{-8.6}^{+12.2}$ $\rm 40.0_{-4.6}^{+5.1}$ $\rm 69.1_{-8.0}^{+8.6}$ $\rm 56.5_{-4.3}^{+7.2}$
C18O 1-0 N(C18O) [1015 cm-2] 2.4-3.8 8.7-20.0 3.5-8.9 9.0-15.1 8.5-17.7
  X(C18O) [10-7] 1.2-1.8 0.72-1.7 0.95-2.4 0.35-0.59 1.7-3.7
C II N([C II]) $^{{\rm {\it a}}}$ [1017 cm-2] 5.25 5.18 3.00 1.47 2.30
  X(C II) [10-5] 2.5 0.43 0.81 0.057 0.48
  [C+]:[C0]:[CO] $^{{\rm {\it b}}}$ [%] 26:16:58 10:12:78 16:12:72 03:10:87 05:09:85
$^{{\rm {\it a}}}$The C II column density was estimated using a method described in Sect. 4.1. $^{{\rm {\it b}}}$This row lists the relative abundance of carbon in the three major gas phase species C II, C I, and CO. The CO column density is derived from the lower C18O column density assuming a relative [CO]:[C18O] abundance of 490.

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