Trends from the spectral results of the clump#1 and clump#2 intervals for all observations (301, 401, 501, and 01). No clumps#1 were identified for Obs. 501 (see Sect. 3.1). From top to bottom: Column density value of the local cold absorption ($N_{\mathrm{H}}^{\mathrm{loc}}$), column density value of the ionized absorption ($N_{\mathrm{H}}^{\mathrm{xabs}}$), and ionization of the gas (log ξ). The uncertainty on the values is shown with error bars. When they are absent, the errors are too small to be visualized.