Laboratory frequencies (or predicted frequencies from laboratory data) minus observed frequencies in IRC +10216 (in kHz) as a function of the frequency of the lines. The different symbols correspond to the following molecules: SiC2 (red filled squares); 29SiC2 and 30SiC2 (red empty squares); HC3N (blue filled squares); the three 13C isotopologues of HC3N (blue empty squares); HC5N (cyan filled squares); C4H (cyan empty squares); 13CS, C34S, C33S, 13C34S, CCS, and CCCS (green filled squares); 29SiS, 30SiS, Si34S, Si33S, and 29Si34S (black empty squares).
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