Fig. 9
Ionic column density measurements of the low and high states of NGC 7469 during 2015 summed over the three velocity components. Fe+20 and Fe+21 interestingly enough seem to exhibit mutual variability, but it is opposite to what is expected - higher state leading to higher ionization, as well as no other ion displaying such behavior. With 90% confidence three to four ions are expected to deviate.
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