thank Lori Allen, Ed Chang, Lynne Hillenbrand, Susan Kleinmann, Michael Skrutskie, and Lloyd Wallace for helpful discussions. Special thanks to John Carpenter for assisting in the initial compilation of the standard star lists, and to Karen Strom and Stephen Friedman for their assistance in making the data available electronically. Antonella Romano provided assistance in preparing the tables and figures for publication. Support for MRM during the final stages of this work was provided by NASA through Hubble Fellowship grant \# HF–01098.01–97A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA under contract NAS 5–26555. SE acknowledges support from the National Science Foundation’s Faculty Award for Women Program. This work was supported in part through a grant from the National Science Foundation (\# AST–9114863) to SES.

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