Correlations between various bulk system parameters and spectral line strengths in the transmission spectrum. The spectral line strengths are expressed as the transit depth at line-center. Specifically, they are the metastable helium line evaluated at 10833.25 Å, the calcium infrared triplet evaluated at 8544.44 Å, the magnesium doublet evaluated at 2796.35 Å, the iron UV2 multiplet evaluated at 2382.76 Å, the carbon triplet evaluated at 1335.68 Å, the oxygen triplet evaluated at 1302.17, and the silicon triplet evaluated at 1264.74 Å. Spearman’s ρ correlation coefficients are quoted in red in each subplot. They are calculated from the quantities as they are labeled on the axes, so in log-log space except for the stellar effective temperature.