Table 2
Derived physical parameters for cis- and trans-MF toward the G+0.693 molecular cloud and L1157-B1.
| Source | Molecule | N (×1013 cm−2) | Tex (K) | υLSR (km s−1) | FWHM (km s−1) | Abundance(a) (×10−10) |
|---|---|---|---|---|---|---|
| G+0.693 | cis-MF trans-MF (Ka = 0) | 60 ± 3 0.82 ± 0.04 | 13.4 ± 0.8 14 ± 4 | 68.3 ± 0.8 70.6 ± 2.5 | 21(b) 21(b) | 44 ± 7 0.61 ± 0.09 |
| L1157-B1(c) | cis-MF trans-MF | 5.5 ± 0.2 0.16 ± 0.02 | 15.7 ± 0.6 14 ± 3 | −0.3 ± 0.1 −0.6 ± 0.3 | 5.5 ± 0.2 5.2 ± 0.6 | 280 ± 40 8±2 |
Notes. (a)We adopted 
for G+0.693, from Martín et al. (2008), assuming an uncertainty of 15% of its value, while we adopted 
cm−2 for L1157-B1, from Lefloch et al. (2012); Di Francesco et al. (2020), assuming an uncertainty of 15% of its value. (b)Value fixed in the fit. (c)For both MF conformers we assumed a source size of 18′′, the same as that derived for the strong shock tracer SiO (Lefloch et al. 2016).
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