Total column density NH of the ionised AGN wind versus the radio-loudness parameter R of the jet. Each data point corresponds to one radio-loud AGN in our sample. For those AGN with multiple absorption components the sum of the column density NH of the components is shown. There is a significant inverse correlation between NH and R. The Spearman’s rank correlation coefficient rs and the null hypothesis probability pnull of the correlation between the parameters are shown inset. The data have been fitted with the power-law function of Eq. (1) shown in dashed black line. The shaded grey region represents the 1σ uncertainty around the best-fit line.
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