Fig. 9
Curve of growth observed for FeKα, that is, EW against NH. The turquoise band marks the expected correlation using numerical simulations. The sources are identified by different symbols when more than one observation is included: 4U 1700-37 (open circle), 4U 1907+09 (open upward triangle), Cygnus X-1 (open downward triangle), EXO1722-363 (open diamond), IGR J16318-4848 (open square), and IGR J16320-4751 (plus). Only one observation for Centaurus X-3, GX 301-2, Vela X-1, and XTE J0421+560 (all four a star symbol).
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