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THE INTEGRATED COLOR INDICES OF M67 AND NGC 188

The integrated color indices of clusters within our own Galaxy are important quantities because they allow comparisons to be made with clusters in more distant galaxies where it is either impractical or impossible to observe individual stars within these clusters. In this note we determine the integrated color indices (BV) and (U-B) and the reddening-free index C = (U-B) -0.72(BV) for the old galactic clusters M 67 and NGC 188.