Excitation temperature profile of the three HC¹⁷O⁺(1−0) and C¹⁷O(1−0) hyperfine transitions across the core. The HC¹⁷O⁺(1−0) 5/2 → 3/2, 5/2 → 7/2, and 5/2 → 5/2 transitions are plotted as a black solid line, a black dash-dotted line, and a black dotted line, respectively. The profiles for HC¹⁷O⁺ are superimposed. The C¹⁷O(1−0) 5/2 → 3/2, 5/2 → 7/2, and 5/2 → 5/2 transitions are plotted as a blue solid line, a blue dash-dotted line, and a blue dotted line, respectively. The inset presents a zoom-in of the radial T_ex profile from 0 to 0.1 pc.