MIPS 24 μm image of the regions around the center of M 33 (left) and the H ii region BCLMP302 (right) in M 33 overplotted with the observed spectra of [C ii]. Filled black triangles in the left box denote positions of the GMCs identified by Gratier et al. (2012) and the star indicated on the eastern part of the E-W cut shows the position of the dynamical center of M 33. The HIFI beam at 1.9 THz is also shown as inset. All spectra are shown on a 10′′ grid. Empty boxes show the intensity and velocity scales for the spectra plotted.