Total Maxwellian-averaged DR and RR ground-state rate coefficients for Cl³⁺: a) black solid curve, previous recommended data of Mazzotta et al. (1998); b) green dashed curve, present MCBP results; c) blue dotted curve, empirical formula of Mewe et al. (1980); d) magenta dotted-dashed curve, present RR rate coefficient; e) black dashed curve with filled circles, present DR rate coefficients omitting n = 3 resonance contributions; f) red dotted-dashed curve with filled triangles, present DR rate coefficients including only the n = 3 resonance contributions; g) brown dashed curve with filled squares, present DR rate coefficients with the n = 3 resonances lowered by − 0.12 Ryd.