HNC (1–0) line properties derived from the automatic fit of one Gaussian component in OMC-3 obtained from our int-CLEAN (blue points) and Feather (yellow points) reductions (targets) in comparison with MACF. For simplicity, only fits with I(HNC, MACF)≥0.5 Jy beam⁻¹ and S/N≥5 are shown. From left to right: (Left panel) Line peak ratio; (central panel) full width at half maximum ratio; (right panel) Velocity difference. The lower envelope of the central panel is determined by the spectral resolution of our (narrow) reductions with δV=0.25 km s⁻¹.