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The authors present UBVRI photoelectric sequences in the galactic globular clusters NGC 1261, NGC 3201, NGC 4590, and NGC 5139 (ω Cen). For the first three clusters, most of the stars were previously observed in UBV by Alcaino (1979, 1976, 1977), and for ω Cen by Cannon and Stobie (1973).
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Alcaíno et al. (1984) studied this question.
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