Fig. 4.
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Spatial variations of spectral properties over the hard-band diffuse emission. Left: Surface brightness (upper panel) in units of 10−15 erg s−1 cm−2 arcsec−2 and energy index of power-law continuum (lower panel) in the 4−6 keV band. Middle: Surface brightness of 6.67 keV Fe XXV emission in units of 10−9 ph cm−2 s−1 arcsec−2 and line EW in units of keV. Right: Surface brightness and line EW of 6.4 keV cold Fe K emission in the same units as the Fe XXV emission.
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