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Table 4

Comparison of XCLASS/MAGIX and GOBASIC fit parameters for methyl formate on W3(H2O).


ηB = 1 a ηB ≈ 0.009 a b single componentc

T (K) 223.05 221(16) 202(17) 1000(140)
NT (cm-2) 9.8(7) × 1014 1.06(6) × 1015 1.25(8) × 1017 8(2) × 1015
Δv (km s-1) 5.86 9.2(4) 8.9(5) 25(3)
v (km s-1) –0.008 0.4(2) 0.3(2) –5.4(8)
τmax (methyl formate) 0.0019 0.27



Full analysis with 21 other molecules included in the fit.


The source size was 2.53′′ based on SMA interferometry data (Hernández-Hernández et al. 2014). The beam size was calculated using Eq. (10) using a CSO dish diameter of 10.4 m.


Fit for methyl formate only without beam-filling correction. The temperature and width stopped at the upper bound of the fitting range.

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