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(a) Average pairwise normalized cross‐correlation (PNCC) and (b) average pairwise overlap of FreeSurfer‐generated regional gray matter labels (PORGM) of spatially normalized Alzheimer's Disease Neuroimaging Initiative (ADNI) data for T1‐weighted templates constructed using data from different numbers of older adults. The error‐bars denote the SD of PNCC and PORGM
