Annular sectors in which we performed the spectral analysis to evaluate the variation in X-ray absorption. The inner and outer radii for each ring are: Ring A (2′-3.37′), Ring B (3.37′-4.88′), Ring C (4.88′-5.62′), Ring D (5.62′-7.27′), Ring E (7.27′-10.85′), Ring F (10.85′-12.1′), and Ring G (12.1′-14.2′). Each ring is divided into eight sectors containing the same number of counts.