Unfortunately there has been an error in the published paper. The reference that we give for the STELIB is obviously wrong, the correct one is this:
STELIB: A library of stellar spectra at R ~ 2000 Le Borgne, J.-F.; Bruzual, G.; Pelló, R.; Lançon, A.; Rocca-Volmerange, B.; Sanahuja, B.; Schaerer, D.; Soubiran, C.; Vílchez-Gómez, R., 2003, A&A 402, 433 ADS: 2003A&A...402..433L
The astro-ph version has already been corrected, but it was too late for the A&A publication…