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Fig. 3

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Spectra of the ground-state transitions of HCN, HCO+, 12CO, and 13CO at the positions of seven GMCs along the major axis of M 33 (cf. Figs. 1, 2). 12CO and 13CO have been observed in position switching; HCN and HCO+ with wobbler switching. The spectra are shown on a main beam brightness temperature scale (Tmb). The velocity resolution is given by the spectrometer with the lowest resolution, i.e. WILMA, and is 5.4 km s-1 in case of 12CO and 13CO, and 6.7 km s-1 for HCN and HCO+. Center velocities are listed in Table 2. The local standard of rest (lsr) velocity displayed covers 300 km s-1. The same velocity range is used to determine the baseline (red lines), excluding the line windows determined from 12CO  1–0 (dotted lines), cf. Fig. A.1.

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