N₂H⁺ (1−0) spectra from Tafalla et al. (2004). 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, our modeled spectra as red, and the baselines as blue. The dimension of $T_{\text{A}}^{*}$ and V_LSR at each cell are −1~3 K and 6~10 km s⁻¹, respectively, denoted in the central cell. Only the central triplet is shown for clarity.