a) Examples of SEDs fitted by a PAH plus double-temperature dust model. Distributions of b) PAH, c) warm dust, and d) cool dust emission, decomposed by the SED fitting. The color levels correspond to the 2.5–1000 μm intensities given in units of erg s^-1 cm^-2 sr^-1. e) Ratios of the warm dust to the PAH and f) the cool dust to the PAH component; the area with PAH intensity levels lower than 0.008 erg s^-1 cm^-2 sr^-1 are masked in calculating the ratios. g) Ratio of the observed 3 μm band intensity to the model-predicted 3 μm intensity. The superposed contours are the distribution of the [CII] emission, the same as in Fig. 1.