Line profiles of the J = 2−1 transitions of CS, C³³S, C³⁴S, C³⁶S, ¹³CS, ¹³C³³S, and ¹³C³⁴S as well as the J = 3−2 transitions of C³³S, C³⁴S, C³⁶S, and ¹³CS toward one typical target (DR21) of our large sample of 110 sources, after subtracting first-order polynomial baselines. The main beam brightness temperature scales are presented on the left hand side of the profiles. The spectra of all 110 objects in our sample are shown in Fig. B.1.