tokens: This research is based on observations made by the Chandra X-ray Observatory and has made use of software provided by the Chandra X-ray Center (CXC) in the application packages CIAO, ChIPS, and Sherpa. P.E. and N.R. acknowledge funding in the framework of the NWO Vidi award A.2320.0076. M.M. is supported by an STFC Ernest Rutherford fellowship (ST/L003597/1). R.P. was partly supported by NSF award AST-1616157. We thank the anonymous referee for many valuable comments. P.E. is grateful to Lia Corrales, Sandro Mereghetti, Elisa Costantini, and Mathieu Renzo for useful discussions. R.P. and P.E. are grateful to Richard McCray for relevant information. Facility: Chandra (ACIS, HRC). Software: ChaRT (Carter et al. 2003 ), CIAO (v4.8; Fruscione et al. 2006 ), FTOOLS (v6.21; Blackburn et al. 1995 ), MARX (v5.3; Davis et al. 2012 ), Sherpa (Freeman et al. 2001 ), XSPEC (v12.9.1; Arnaud et al. 1996 ).
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