Figure 4.  Modelling of the C-K edge region using the data from XTE J1118+48.  The top plot shows a simple model consisting of a constant flux (at 100 counts/bin) multiplied by the carbon absorption component of the OBF model, as decomposed.  The optical depth of the carbon component was increased by 13% to match the data in the 0.283-0.2865 keV region.  The data were then corrected by this adjusted filter model to obtain the data in the lower plot.  The residual is a sharp edge recovering smoothly beyond 0.2870 keV.

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