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a-element enhancement a-enhanced isochrones apparent distance modulus appears artificial star Bergbusch blending blue HB blue stragglers bolometric correction Bolte brighter Buonanno Buzzoni calculated calibration CFHT cluster center color terms color-magnitude diagram comparison core CTIO derived detected determined difference distance modulus effects exposures faint fainter Fe/H fiducial line fiducial points frames Fusi Pecci giant branch globular clusters H H H HB stars helium abundance I I I I I I I I indicator instability strip isochrones luminosity function magnitude bins magnitude for M30 main sequence mass function mass segregation measured metal content metal-poor number of stars oxygen-enhanced isochrones photometry Piotto population range ratio red giants residuals result RGB bump RR Lyrae variables secondary standards slope Sneden standard stars stellar stellar rotation subdwarf subdwarf fitting subgiant branch theoretical LFs trend turnoff upper RGB V-band VandenBerg versus instrumental zero-point Zinn