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Table 4

Calculated column densities (cm-2) at R = 250 AU.

Gas phase Grain surface
Species W071 SW112 WNMA123 This work WNMA123 This work

Carbon monoxide CO 2.9(17) 1.2(18) 1.3(18) 3.1(17) 2.1(14) 2.4(17)
Formaldehyde H2CO 3.9(12) 2.4(13) 5.9(12) 7.2(12) 1.7(14) 2.9(17)
Methanol CH3OH 1.5(11) 6.1(08) 1.9(12) 1.7(13) 8.4(16) 7.7(17)
Formic acid HCOOH ···  1.4(11) 9.8(13) 1.6(13) 2.1(16) 6.1(16)
Cyanoacetylene HC3N 7.0(11) 2.9(11) 2.5(12) 1.7(11) 2.9(08) 4.0(12)
Acetonitrile CH3CN 4.9(10) 6.0(10) 5.6(12) 7.3(11) 5.8(15) 2.5(15)
Acetaldehyde CH3CHO ···  8.0(07) 6.2(10) 3.4(11) 2.2(15) 3.7(16)
Formamide NH2CHO ···  2.0(10) ···  9.2(11) ···  1.4(16)
Methyl formate HCOOCH3 ···  8.8(04) 3.5(08) 2.7(11) 1.8(11) 1.1(16)
Ethanol C2H5OH ···  4.4(06) 1.4(12) 6.1(10) 1.8(16) 6.9(15)
Dimethyl ether CH3OCH3 ···  4.2(02) 7.0(09) 7.6(10) 1.4(14) 1.2(16)
Acetone CH3COCH3 ···  1.3(03) 2.8(06) 4.2(09) 2.6(09) 6.2(15)

Notes. a(b) represents a × 10b.

Reference. (1) Willacy (2007, W07); (2) Semenov & Wiebe (2011, SW11); (3) Walsh et al. (2012, WNMA12).

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