For two epoch observations (left: E1, right: E2). The H I emission spectrum ﹩{T}_{B,\exp }(v)﹩ and the fitting spectra ﹩{T}_{B,\exp ,\mathrm{Gpy}+}(v)﹩ in the red line (the top panels), the fitting residual of the H I emission spectrum (the second panels), the optical depth profile τ(v), the decomposed Gaussian components in the dashed blue lines, and the fitting optical depth profile τGpy+(v) in the red line (the third panels), and the fitting residual of the optical depth profile (the bottom panels). The spectra were binned in velocity to a channel width of 0.6 km s−1.