Obtained best-fit models towards L1448 C using the two velocity-component method for N2H+ (top panels) and N15NH+ (bottom panels), overlaid on the observations (black histograms). The two components are shown as the dashed blue curve and the dash-dotted red curve. The total modelled spectrum is shown as the solid green curve. The right panels show the zoom-in on the central hyperfine group, highlighted with the grey shaded area in the corresponding panels on the left.
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