Table 5: CO-ice band optical depth and column density derived from the phenomenological decomposition.

Source		 $N_{{\rm CO}}^{{\rm total}}$ $\tau^{{\rm bc}}_{{\rm CO}}$ $\tau^{{\rm mc}}_{{\rm CO}}$ $\tau^{{\rm rc}}_{{\rm CO}}$ $N_{{\rm CO}}^{{\rm bc}}$ $N_{{\rm CO}}^{{\rm mc}}$ $N_{{\rm CO}}^{{\rm rc}}$ $N_{{\rm CO}}^{{\rm mc}}$/
  (1017 cm-2)       (1017 cm-2) (1017 cm-2) (1017 cm-2) $N_{{\rm CO}}^{{\rm rc}}$

LLN 8		 <1.8 <0.10 ... ... ... ... ... ...
LLN 13 $12.15\pm1.71$ $0.37\pm0.12$ $1.90\pm0.12$ $0.36\pm0.12$ $1.10\pm0.39$ $6.53\pm0.15$ $4.52\pm1.62$ 1.44
LLN 17 $5.37\pm2.22$ $0.25\pm0.15$ $0.18\pm0.15$ $0.32\pm0.15$ $0.72\pm0.48$ $0.61\pm0.19$ $4.04\pm2.10$ 0.15
LLN 17b $3.83\pm1.74$ <0.51 $1.13\pm0.51$ <0.51 <1.5 $3.83\pm0.58$ <6.39 >0.6
LLN 19b <1.8 <0.10 ... ... ... ... ... ...
LLN 19c $0.43\pm0.05$ $0.02\pm0.005$ $0.03\pm0.005$ $0.025\pm0.005$ $0.07\pm0.02$ $0.10\pm0.02$ $0.25\pm0.05$ 0.41
LLN 41 $4.09\pm2.16$ <0.15 $0.48\pm0.15$ $0.18\pm0.15$ $0.14\pm0.15$ $1.64\pm0.18$ $2.27\pm2.04$ 0.72
LLN 41b <1.8 <0.10 ... ... ... ... ... ...
LLN 20d $5.19\pm0.96$ $0.12\pm0.07$ $0.38\pm0.08$ $0.29\pm0.04$ $0.35\pm0.20$ $1.29\pm0.27$ $3.55\pm0.49$ 0.36
LLN 33d $7.85\pm0.81$ $0.21\pm0.05$ $0.94\pm0.09$ $0.33\pm0.03$ $0.61\pm0.14$ 3.20$\pm$0.31 $4.04\pm0.37$ 0.79
LLN 39d $0.44\pm0.16$ $0.004\pm0.003$ $0.02\pm0.01$ $0.03\pm0.01$ $0.011\pm0.008$ $0.068\pm0.034$ $0.37\pm0.12$ 0.18
LLN 47d <0.36 <0.06 <0.02 <0.01 <0.17 <0.07 <0.12 ...

a The error bars are 3$\sigma $ level. b Low resolution spectrum. c Medium resolution spectrum. d Data from Pontoppidan et al. (2003b).

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