ACIS-I photon image of the stowed dataset of periods D + E in the continuum band in detector coordinates. Darker and lighter patches indicate lower or higher photon number, respectively. The 4 CCDs are divided by the CCD gap in the middle of the image. The upper left square corresponds to CCD0. The image has been binned with detx = 4 and smoothed with a Gaussian kernel with σ = 19 pixels. Grey external rectangles indicate the position of the frame store areas for each ACIS-I chip. The x and y arrows indicate the chip coordinate reference frames for each CCD. The four rectangular areas in CCD0 indicated by increasing number are our analysis strips defined in the text.