Left panel: Light curve above 200 GeV of the central source in the Galactic Centre as would be seen during night-by-night 3 h observations by a sub-array of four LSTs without absorption (full circles and solid lines) and during the absorption (empty circles and dotted lines). Next to each point a statistical significance of the difference between the two curves is reported. Right panel: Corresponding spectral energy distribution during the peak of the absorption. The parameters of the star are as in Figs. 2a/e.