Correlations between kinematic and luminosity properties of the [O I]630 NLVC and UV H₂ lines. From top to bottom: H₂ [1,7] versus H₂ [1,4], H₂ [1,7] versus [O I], and H₂ [1,4] versus [O I]. The black dashed lines represent the one-to-one correlations, while linear fits are shown as red dashed lines. The SO518 source (orange circled point) was excluded from the fit (see Sect. 5.1 for details). The Pearson coefficients are also reported. The v_p errors on H₂-UV lines reported in these plots are those resulting from the Gaussian decomposition procedure (Sect. 3). The estimated ~15 km s⁻¹ uncertainty due to the wavelength calibration of COS should be added in quadrature.