Partial (isolated) effects of T_eff, t̄_★, [Fe/H], and direction of motion on the predicted survival time (in this case, the predicted A(Li)), derived from a parametric survival model (SURVREG with logistic distribution). Each subplot illustrates the dependence of the predictor on one covariate, while holding all other covariates fixed: T_eff, t̄_★, and [Fe/H] are set to their mean values to represent central tendencies, while the direction of motion is set to zero as a neutral reference point for directional data. Uncertainty in the partial effects is quantified by 95% (~2σ) and 99% (~3σ) confidence intervals, which account for the flexibility of the penalised splines (PSPLINE) used to model each covariate.