Color distribution analysis for the MSs stars of NGC 6752 in two different radial bin, containing almost the same number (855 and 854) of stars. In the inner field (left panels) we found that MSa (blue) and MSbc (red) contain 28 ± 6% and 72 ± 4% of MS stars, respectively, in the V versus c_U,B,I CMD, and 27 ± 6% and 73 ± 4% of MS stars, respectively, in the B versus (U − B) CMD. In the outer field (right panels) we found that MSa and MSbc contain 26 ± 7% and 74 ± 4% of MS stars, respectively, in the V versus c_U,B,I CMD, and 29 ± 8% and 71 ± 6% of MS stars, respectively, in the B versus (U − B) CMD.