[C II] spectra along position cut 1 (cf. Fig. 12) in M 43 with Gaussian fits. Each spectrum is averaged over 75.5′′ × 25.2′′. The expanding shell has a distinguished emission peak. Additionally to the main component and the shell component, we fit a third, broad, component, that possibly stems from the ionized gas within the shell. Coordinate offsets indicate the lower left-hand corner of the rectangle over which the spectra are averaged; Δα =242′′. The fit parameters are given in Table 2.