o-H₂D⁺ (1₁₀−1₁₁) spectra. The x- and y-axes of the grid are the RA and Dec offsets with respect to the center of L 1498. Each cell shows the observational spectra as black, the modeled spectra as red, and the baselines as blue. The 3σ noise levels are shown in green horizontal lines. The dimensions of $T_{\text{A}}^{*}$ and V_LSR at each cell are −0.1~0.25 K and 7~9 km s⁻¹, respectively, denoted in the cell closest to the core center, (0.5″, 0.5″).