The Victoria-Regina stellar models and isochrones.
The main paper explaining how to use and from where to download software and tables with bolometric corrections that are needed by the Victoria-Regina isochrones is here.
"Cleaned" Sarajedini's HST/ACS CMDs of some globular clusters. The original raw data are here.
M3 (NGC 5272) The first and second columns contain the F606W magnitude and (F606W-F814W) colour.
A theoretical ZAHB computed with MESA rev. 7624 for M=0.8, [Fe/H]=-1.55, [alpha/Fe]=+0.4 and Y=0.25, transformed to the (F606W,F606W-F814W) colour-magnitude plane (the absolute magnitude is in the 8th and the colour in the 9th column).