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Table 6

Parameters derived from RATRAN models with a drop profile for individual sources in groups D8 and D24.

Source M(mean) M(mode) 68%int ncrit(mean) ncrit(mode) 68%int Rdep(model) Rdep(τdep)
(102M) (102M) (102M) (103 cm-3) (103 cm-3) (103 cm-3) (pc) (pc)

AGAL008.684-00.367 74 70 61 − 85 13.7 13.8 10.4 − 18.2 ~ 0.7 ~ 0.3
AGAL010.444-00.017 27 25 22−32 4.0 4.0 3.2−5.3 ~0.8 ~0.2
AGAL013.178+00.059a 9.3 8.9 7.9−11 21.5 20.4 15.7−29.2 ~0.3 ~0.2
AGAL014.492-00.139 6.8 6.9 5.6−7.7 12.2 12.6 10.0−14.7 ~0.3 ~0.2
AGAL018.606-00.074 19 19 16−22 28.7 25.6 14.4−56.9 ~0.2 ~0.2
AGAL028.564-00.236 16 16 14−18 10.0 10.0 8.0−12.7 ~0.4 ~0.2
AGAL034.411+00.234 2.8 2.8 2.4−3.3 78.7 77.5 71.0−87.8 ~0.2 ~0.3

Notes. The columns show the mean, mode and the shortest 68% interval of the derived mass and critical density of molecular hydrogen above which CO is completely locked up onto grains, the radius of the central depletion zone derived from the RATRAN models (Rdep(model)) and from the depletion timescale as a function of radius (Rdep(τdep), see text) for a lifetime of the starless clump ~ 105 yr, respectively.

(a)

For this source, to obtain an acceptable fit we used Td = 30 K and fD = 2 for the external layers.

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