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Fig. 2.

image

MOLPOP-CEP results for the CO SLEDs of uniform slabs, computed with different methods (the line cooling coefficient j is defined in Eq. (11)). The y-axis scale of each panel is listed at its top-left corner. Columns have the same temperature, listed at the top, rows the same H2 density, marked in each leftmost panel. Optical depths are set from [CO] υ = 10−4 pc (km s−1)−1, where [CO] is the CO abundance. Full CEP calculations using grids with 10 and 20 zones are plotted with solid lines of different colors, as marked. When the 20-zones line (blue) is missing, it is because it coincides with the 10-zones result (red), demonstrating CEP convergence in practically all cases. Dashed lines show results for different escape probabilities (see Fig. 1). Note that the slab escape probability calculation is the same as single-zone CEP.

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