HR2 vs. X-ray photon index. NLS1 candidates (in blue) have Γ mostly larger than 1.8 and are unabsorbed, as expected. For narrow-line sources (in red), some have typical properties of Seyfert 2 (Γ < 1.8 and intrinsic absorption) while the others, with low HR2, cannot be clearly classified using their photon index. One of the sources with very large photon index value and error is not plotted.
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