Log g distribution of all the stars selected (and spectral typed) as A stars. There are two distinct populations: one centered around log g = 3.2 and one around log g = 4.0. The population with lower surface gravity is consistent with BHB giants, while the higher surface gravity population is composed of main-sequence stars and/or blue stragglers. The dashed line at log g = 3.8 marks the distinction between main-sequence stars (to the right of the line) and BHB giants (to the left of the line).