Top: T_eff obtained with isochrone best-fitting method (from PARSEC isochrones, Bressan et al. 2012) compared against T_eff obtained via IRFM (color-temperature relations, González Hernández & Bonifacio 2009, upper panel) and XPP (Zhang et al. 2023, lower panel). Bottom: T_eff obtained with XPP vs. T_eff obtained with IRFM. The 1 -to- 1 relation is shown as a gray dashed line, whereas the best fit (considering GC and OC stars) is shown as a dot-dashed green line. BSSs from GCs are displayed as red stars and BSSs from OCs as blue squares. The figure only displays BSSs whose error in both components is less than 300 K.