Real (ϵ_Re, in blue) and imaginary (ϵ_Im, in red) part of the dielectric function versus pump-probe time delay. The values of ϵ_Re and ϵ_Im for the solid and liquid phase are shown by horizontal dashed lines. The fitting curves, explained in the main text, are shown as grey dashed lines. (a) ϵ_Re in the full measured time range. (b) ϵ_Im in the full measured time range. (c) Zoom-in of ϵ_Re on the first 4 ps, with data points marked by circles for better visibility. (d) Zoom-in of ϵ_Im on the first 4 ps, with data points marked by circles for better visibility.