MALT90 spectra toward the > 100 M⊙ quiescent cores at < 5 kpc. The source names are shown in the title. HCO+/H13CO+ and SiO lines are plotted in the top and bottom panels, respectively. The VLSR is indicated with a vertical line in the HCO+/H13CO+ plot. The residual of the H13CO+ fit is shown in green, offset by −0.4 K.
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