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Table 6

Best-fitting (Best, i.e. lowest ) and most probable (Proba, i.e. highest probability) parameters assuming different grain compositions (see text for the definition of the parameters).

Composition v Si v C v ice amin(μm) κ Mdust(M)

1-material (d.o.f. = 45)
Si Proba: 1.00 0.99  ±  0.13 –3.43  ±  0.04 0.35  ±  0.03
Best: 1.00 1.00 –3.42 0.35 10.3
C Proba: 1.00 1.62  ±  0.03 –3.65  ±  0.07 0.15  ±  0.03
Best: 1.00 1.62 −3.64 0.15 7.75

2-material (d.o.f. = 44)
Si+C (1) Proba: 0.007† 0.99  ±  0.04 1.62  ±  0.03 –3.65  ±  0.07 0.15  ±  0.03
Si+am.ice Proba: 0.59† 0.41  ±  0.05 0.15  ±  0.13 –3.36  ±  0.07 0.26  ±  0.05
Best: 0.60 0.40 0.16 –3.35 0.26 8.90
Si+cr.ice Proba: 0.67† 0.33  ±  0.12 0.29  ±  0.24 –3.35  ±  0.02 0.27  ±  0.04
Best: 0.65 0.35 0.26 –3.35 0.27 10.4
Si+ Proba: 0.94† 0.057  ±  0.062 0.98  ±  0.20 –3.42  ±  0.05 0.35  ±  0.04
Best: 0.025 0.975 0.010 –3.28 0.039 11.9

3-material (d.o.f. = 44)
Si+C+ Proba: 0.33† 0.67† 0.95  ±  6 × 10-5 9.45  ±  3.20 –3.13  ±  0.09 0.042  ±  0.001
Best: 0.33† 0.67† 0.95 10.0 –3.14 0.042 6.05
Si+C+ice Proba: 0.07† 0.13† 0.700  ±  0.002 0.78  ±  0.04 –3.50  ±  0.03 0.11  ±  0.01
Best: 0.07† 0.13† 0.80 0.55 –3.42 0.11 4.48

4-material (d.o.f. = 43)
Si+C+ice+ Proba: 0.11† 0.22† 0.67  ±  0.07 0.63  ±  0.21 0.81  ±  0.31 –3.41  ±  0.09 0.051  ±  0.016
Best: 0.12† 0.23† 0.65 0.65 0.89 –3.42 0.048 1.64

Notes. The most probable parameters are given with 3-σ uncertainties. The volume fractions marked with the † symbol are imposed knowing the other free volume fractions. “d.o.f.” means degrees of freedom (see Appendix A). (1) The best fit for the Si+C mixture is obtained for silicate-free grains. The best-fitting parameters for that solution are given in the 1-material part of the table.

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