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Table C.1.

Lines employed to compute the upper limits to the column density of the isocyanates that have not been detected towards G+0.693.

Molecule Frequency QNs Eu N
(GHz) (K) (mK km s−1) (cm−2)
NCO (2Π3/2) 81.404300 7/2  −  5/2 F = 9/2  −  7/2 e 6.7 25 < 1.4  ×  1013
81.404813 7/2  −  5/2 F = 9/2  −  7/2 f 6.7 25
c-C2H3NCO 46.281730 82, 7-72, 6 13.1 46 < 9.3  ×  1012
t-C2H3NCO 33.483408 70, 7-60, 6 6.4 21 < 2.5  ×  1012
NCNCO 42.364035 80, 8-70, 7 9.2 19 < 1.2  ×  1012
HCCNCO 35.291156 70, 7-60, 6 7.1 28 < 8.9  ×  1012

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