Plummer-like density profile fittings. The black dots are the A_V values at each pixel in the horizontal strip shown in Fig. 6c but these are separated between the east and west sides. The orange squares with error bars show the averaged A_V profiles, which are azimuthally binned with radial 10′′ bin. The blue circles show the best-fitted A_V models for the east and west sides. The A_V models are derived from spherically symmetrical Plummer-like density profiles. The best-fitted characteristic radii, R₀, and the fitting ranges, R_fitting of the A_V models are denoted in blue solid and dash-dotted lines, respectively. The coverage of our spectral observations are denoted in black dashed lines.