Fig. 6
Upper-left: the CCD map in the 7.0−10.0 keV energy band from 6.3 Ms of BFs, normalized to the central raw to show the NXB vertical gradient; Lower-left: the residual distribution calculated in 50 × 50 pixel cells. Upper-right: the CCD map in the 7.0−10.0 keV energy band from 6.3 Ms of BFs, normalized to the central raw to show the NXB vertical gradient, corrected by the linear approximation. Lower-left: the residual distribution calculated in 50 × 50 pixel cells with the linear gradient correction applied.
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