Gilligan And O Malley, The isochrones that fit the calibration stars best were then used to determine the distances and ages of 22 GCs with metallicities ranging from −2.

Stellar isochrone - Wikiwand

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R-matrix fit to the S(E) data for the R,DC→0.0 transition. The solid

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Isochrones for a cluster of stars with masses between 0.7 M☉ and 3.5 M☉