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Table 4

Column density and mass ratios observed towards star #947.

Mass ratio Column density ratios

#2 #947 ISMa

graphite/silicate 0.2b 1.6b 0.4
H2Oice/silicate 0.18b
COice/silicate 0.15b
COice/H2Oice 1.0b
N(COice)/N(COgas) 0.8–1



Abundance limited ratio (=1.81) such that all C-atoms exist as graphite and all Si-atoms are incorporated into silicates;


from modelling;


from band strengths.

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