Line-of-sight velocity dispersion fit with pPXF and main spectral absorption features contributing to the measurement. We chose the cluster member ID 82063 of M0416 (RA = 64.0401169, Dec = −24.0659218, S/N = 133). The regions masked as potentially affected by issues with the subtraction of sky features and emission lines are shaded in grey. We note that the mask in the spectral region around 4200 Å is intended to avoid the effects of the adaptive-optics laser emission used for some MUSE exposures of M0416, and as such was not adopted for the other three clusters. We show the observed spectrum in black, the best fit in red, and the fit-measured spectral residuals in green. The main absorption lines are marked with red vertical dashed lines.