V, I and H_F160W-band SBF versus (V − I) predictions from five independent stellar population synthesis codes: solid line (black), dotted line (red), dashed line (blue), long-dashed line (green), dot-dashed (cyan) line show the updated SPoT, Blakeslee et al. (2001), Liu et al. (2002), Marín-Franch & Aparicio (2006), and González-Lópezlira et al. (2010) best fit lines, respectively. Empty (magenta) circles show the corresponding empirical relations, also given in Table 5. (See electronic version of the Journal for a colour version of the figure.)