Diagnostic diagram of the [C II]/[O I](63 μm) ratio plotted against the ([C II]+[O I](63 μm)/TIR ratio for M 33, using the corrected [O I] intensities (see Sect. 3.2.4). Median and standard deviation of the four regions are shown in color, and of all data (star and large errorbars). Colors correspond to the four different regions as described in Sect. 3.1: the TIR bright, inner region (red), the bright, outer region (blue), the weak, inner region (green), and the weak, outer region (black). Superimposed is a grid of constant hydrogen nuclei density n (dashed contours) and FUV field strength G0 (solid contours) from PDR models (Kaufman et al. 1999, 2006). We note that for many ratios there are two solutions for n, G0. Upper panel: solutions with moderate n, G0. Lower panel: low-FUV solutions.
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