Spherical physical model of G205.46−14.56 M3 B1 based on spectra extracted along the southwest cut in the non-LTE radiative transfer analysis. The finer model grid (light gray vertical lines) resolves the x(o-H₂D⁺) profile with a step size of 0﹩\mathop{.}\limits^{^{\prime\prime} }﹩79, while the coarser model grid (dark gray vertical lines) resolves the x(N₂D⁺) and x(N₂H⁺) profiles with a step size of 2﹩\mathop{.}\limits^{^{\prime\prime} }﹩38. (a) Plummer-like ﹩{n}_{{{\rm{H}}}_{2}}﹩ profile is adopted from D. Sahu et al. (2023), with error bars reflecting a factor-of-2 variation due to typical dust opacity uncertainties. (b) T_k profile is assumed to be 10 K, except for r < 1﹩\mathop{.}\limits^{^{\prime\prime} }﹩91, where 8 K is inferred from multitransition N₂H⁺ observations. The T_ex profiles derived from non-LTE modeling are shown for each spectral line. (c) Volumetric abundance profiles, including (d) N₂H⁺ deuteration, are fitted to the extracted spectra (Figure 4) with 1σ error bars shown. Chemodynamical model results at a core age of 0.42 Ma for the ﹩{n}_{{{\rm{H}}}_{2}}﹩, T_k, x(o-H₂D⁺), and several deuteration profiles are overlaid for comparison.