tokens: This material is based upon work supported by the National Science Foundation (NSF) under grant AST-1211146 to C.W.M. We also gratefully acknowledge support by Chandra X-Ray Center award 1170050. C.S.K. is supported by NSF grant AST-1009756, and F.C. and G.M. are supported by the Swiss National Science Foundation (SNSF). This research made extensive use of the USNA high performance computing cluster. We thank the reviewer for valuable comments which improved the manuscript. Facilities: CTIO:2MASS (ANDICAM) , HST ( NICMOS , ACS ), Euler1.2 m , CXO (ACIS)
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