Maps of (a) CO excitation temperature distributions and (b) H₂ column density distribution traced by ¹³CO. The black contour line corresponds to the intensity of the 8 µm flux starting at 1.3 × 10⁻⁶ W/(m⁻² sr) and going up in steps of 5 × 10⁻⁶ W/(m⁻² sr). The four red lines are the intercepted paths for the four parameter (¹²CO intensity, H₂ column density, T_ex, and 8 µm flux) value distributions in the Fig. 7, and the red numbers indicate the starting position of each path. The yellow stars and black crosses are same as Fig. 2.