Fig. 13
From: Detection of cavities in a salt mine with cosmic muons: expected results and first data

Ratio of count rates of Period 1 per Period 2: no angular inhomogeneities observed, despite track rate fluctuations in Period 2.
From: Detection of cavities in a salt mine with cosmic muons: expected results and first data

Ratio of count rates of Period 1 per Period 2: no angular inhomogeneities observed, despite track rate fluctuations in Period 2.