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Table K.1

Synthetic fitting of the undetected main S-bearing species toward TMC1 for an excitation temperature of 40 K, FWHM of 1 km s−1, and source size of 1.5″.

Species Transition Frequency (GHz) Eup (K) Aij (s−1) Beam size (″) N (cm−2)
H2S 22,0-21,1 216.710 84 4.9×10−5 6.4 ≤1.5×1013
OCS, υ = 0 19-18 231.061 111 3.6×10−5 5.9 ≤2.6×1013

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