Global Optimization and Broadband Analysis Software for Interstellar Chemistry (GOBASIC)

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Table 4

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

	XCLASS	GOBASIC

		η_B = 1 ^a	η_B ≈ 0.009 ^a ^b	single component^c

T (K)	223.05	221(16)	202(17)	1000(140)
N_T (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)
τ_max (methyl formate)		0.0019	0.27

Notes.

^(a)

Full analysis with 21 other molecules included in the fit.

^(b)

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.

^(c)

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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