PDR modeling results for Spider, Polaris, and Musca. Parameter space of hydrogen density n and FUV field calculated from the KOSMA-τ model taken from the PDR toolbox for the Spider 1 position (left, 0.1 M_⊙ clumps), the Polaris single pointing (middle, 1 M_⊙ clumps ), and the Musca single pointing (right, 0.1 M_⊙ clumps). The isocontours at different colors show the observed line integrated intensities or ratios, including the rms noise. The estimated FUV field for each source from the 160 µm flux is indicated by a red dashed line. The FUV field from the census of the stars is given as a dashed blue line.