Table 11: Parameters used to determine the CO depletion factor: source Galactocentric distance ( $D_{\rm GC}$), "expected'' C17O abundance ( $X_{\rm C^{17}O}^{\rm E}$), integrated intensity of C17O at the dust peak position ( $I({\rm C^{17}O}))$), beam filling factor ( $\eta _{\nu }$), C17O total column density ( $N({\rm C^{17}O})$), observed C17O abundance ( $X_{\rm C^{17}O}^{\rm O}$) and CO depletion factor ($f_{\rm D}$).
Source $D_{\rm GC}$ $X_{\rm C^{17}O}^{\rm E}$ $I({\rm C^{17}O}))$ $\eta _{\nu }$ $N({\rm C^{17}O})$ $X_{\rm C^{17}O}^{\rm O}$ $f_{\rm D}$
  (kpc) ( $\times 10^{-8}$) (K km s-1)   ( $\times 10^{15}$cm-2) ( $\times 10^{-8}$)  
05345+3157 6.38 8.62 4.10 0.34 6.04 2.9 3.0
05373+2349 6.96 7.38 $\leq$2.38 0.62 $\leq$1.99 $\leq$0.9 $\geq$8.2
18144+3157 8.85 4.62 6.78 0.64 5.61 1.2 3.8
18511+0146 11.5 2.56 12.84 0.93 7.73 6.0 0.4
18517+0437 7.85 6.0 8.11 0.88 7.39 9.2 0.7
19092+0841 5.64 10.6 9.46 0.72 9.03 3.3 3.2
20126+4104 4.67 14.3 5.75 0.83 3.65 0.4 35.8
20216+4107 7.47 6.47 7.13 0.62 5.93 3.2 2.0
20343+4129 6.88 7.54 3.86 0.91 2.17 0.4 18.8
22172+5549 9.42 4.05 2.39 0.83 1.45 0.5 8.1

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