Figure 4. Hourly averages of the data acquired during the non-stationary period (December 13^th 2014 to January 22^nd 2015).

(a) Atmospheric pressure time-variations relatively to p₀ = 1016.8 hPa. (b) Muon flux relative raw time-variations (black curve), and corrected from the atmospheric pressure influence (red curve). (c) Water level variations.