Fig. 17

CO ice mantle build up as a function of the cloud lifetime, expressed as
, for a
cloud density of 3 × 104 cm-3 and
Tgas = Tdust = 11.5 K. The
dashed gray trace corresponds to accretion for
Rth − des(CO) = 0. The solid black trace corresponds to
Eq. (13) with
Rph − des(CO) = 0 and
Rth − des(CO) from Eq. (12).
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