Reconstruction of the Fe I absorption. All profiles are from the epoch 2 ESPRESSO spectrum. All lines are plotted relative to the rest wavelength of Fe I 3969. The top panel shows the continuum subtracted profile of the Ca II H + Hϵ blend (black) compared to the Ca II K (green) and H8 (blue) lines. The red line is the model for the unabsorbed blend (Eq. (2)). The vertical dashed lines indicate the velocity displacement of Ca II H, Fe I 3969 and Hϵ relative to the rest wavelength of Fe I 3969. The middle panel shows the Fe I 3969 absorption profile, reconstructed as explained in Sect. 4.2, and its best fit. The bottom panel shows the Fe I 4064 and 4132 emission lines.