Scatter plot showing residuals after fitting λ _LSR vs. ﹩{\ell }^{\prime} ﹩ and d where the color shows the weighting of each point in the fit. Only detections such that ﹩| {\ell }^{\prime} | \lt 10^\circ ﹩, ∣b∣ < 10°, and d < 3 kpc are shown. Our derived rest-frame wavelength of λ _rest = 8623.14 ± 0.087 Å is bluer than Schultheis et al. (2023), but our updated value is validated in Figure 8 by comparison with CO gas velocities.