Best-fit value of the normalization with its 3σ uncertainty for every sky region of XCS-DR1: Top left: with Δl = 90°, Δb = 180° as a function of its central Galactic longitude, with the best-fit normalization value for the whole sample (purple). Top right: with Δl = 360°, Δb = 40° as a functionof its central Galactic latitude. Bottom left: for the LX–T (blue) and T–LX (red) fitting. Bottom right: for XCS-DR1 (blue) and ACC (red) with their best-fit values for the whole sample (green line for ACC and purple line for XCS-DR1). Given the bin widths, the data points are obviously strongly correlated.
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