Visualextinction maps and profiles. (a) Envelope A_V map derived from J, H, and K_s bands with the R_V = 3.1 model. (b) Core A_V map derived from H, K_s, and IRAC2 bands with the R_V = 5.5 B model. (c) Combined A_V map merged from the previous maps with boundaries at A_V = 2.5 mag. Each map is convolved with a Gaussian beam size of 30′′. (d) Comparison between A_V profiles inside the strips of panel a and b. The A_V values at each pixel are denoted in light blue and pink dots, while their average errors are indicated in the bottom left corner. The A_V profiles are averaged in azimuth with radial 10′′ bin and shown in blue triangles and red squares with their error bars. The green dashed lines in the four planes indicate the A_V threshold of 2.5 mag.