LR versus L2 − 8 keV diagram. Dashed lines indicate, from left to right, the ratios log (X/R) = −1, log (X/R) = 0, and log (X/R) = + 1. Red, green, and blue symbols are defined as in Fig. 10, and reported in the legend. All the intermediate source LR estimates refer to their total luminosities.
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