Observed line parameters (Table B.1) of H3O+, HCO+ (narrow component), and CH vs. the observed line characteristics of CH+. The Pearson correlation coefficient ρ is given where statistically significant (see Sect. 4.2). The upper limit for L 1489 is not included in the analysis. The symbols indicate different types of objects: Red diamonds for Class 0, yellow triangle up for Class I (L 1489), brown circle for intermediate mass, light blue triangle down for high-mass mid-IR quiet (NGC 6334 I(N)), green square for high-mass mid-IR bright and hot molecular core, and dark blue triangle left for high-mass ultra-compact HII (NGC 7538 IRS1).
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