tokens: We thank Adam Ingram and Guglielmo Mastroserio for kindly providing the most recent reltrans model and for discussions on implementing it. B.M.C. and E.M.C. gratefully acknowledge support through NSF CAREER award No. AST-1351222. Software: XSPEC (v12.9.1; Arnaud 1996 ), reltrans (Mastroserio et al. 2018 , 2019 ; Ingram et al. 2019 ).
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