Distributions of the EMC analysis of each individual night for different spectral lines: Na I D1 and D2, Mg I λ5184, Fe I λ5270, Hα, and K I D1. The absorption depth calculations are performed using 0.4 Å bandwidth except for the Hα for which we use 0.5 Å. In green we present the ‘out-out’ scenario, in red the ‘in-in’, in blue the ‘mix-mix’, and in grey the ‘in-out’. The blue dashed vertical lines show the zero absorption level. In coloured dashed lines, we show the Gaussian fit to the histograms.