Modeling spectra with various FeII templates for the old and the new redshift. Upper panel: Four fits of Observation 14 in the observed frame: two models for the old redshift z = 1.37648, d12 and VW01 templates with extra broadening, and two for the new redshift z = 1.39117, the KDP15 template, shift = 0, FWHM = 4200 km s⁻¹, and the VW01 template with additional broadening. Dashed lines show the corresponding continua. Middle panel: FeII contribution in the rest frame for all the FeII templates used for the fits in the upper panel (see the legend). Lower panel: Decomposition of the fitted FeII with the KDP15 template into individual multiplets: I Zw 1 (red dashed line), multiplet 60 (blue long dashed), multiplet 61 (green, dash-dot), multiplet 62 (yellow, invisible in the scale), multiplet 63 (magenta, dotted), and multiplet 78 (cyan, almost invisible in the scale), with the black line corresponding to the total FeII emission. The FeII flux density in all three panels is expressed in erg s⁻¹ cm⁻² Å⁻¹.