Relative cooling budget of the [O i]63 and 145 μm, [C ii]158 μm lines, and the 0-0 S(1), S(2), S(3) H₂ rotational transitions and v = 1–0 S(1) in percentage (%). Adding the contribution of all four species for a given point in the map amounts to 100%. Other species that can contribute to the cooling are ignored in this figure (see Sect. 4). In the first panel we show a contour of the PDR as traced by the [O i]63 μm emission to guide the eye. The images have been convolved to the largest of the beam sizes of these species, in this case the [C ii]158 μm line, shown as a solid circle in the [CII] panel. In addition, and for comparison, we also show the largest CO beam size (25″) used to calculate the cooling budget in Table 1 as a dashed circle.