Fig. 2.
Examples of the spatial distributions of the PAH, hot dust, warm dust, and cold dust, from left to right. The thick and thin white circles correspond to the |$R$| and |$2R$| circular regions, respectively. (Color online)
Examples of the spatial distributions of the PAH, hot dust, warm dust, and cold dust, from left to right. The thick and thin white circles correspond to the |$R$| and |$2R$| circular regions, respectively. (Color online)
