Figure 4
From: High-definition and low-noise muography of the Sakurajima volcano with gaseous tracking detectors

The comparison of measured and expected fluxes. The measured flux with 1σ error bars is plotted as the function of elevation angle within ±10.9 mrad horizontal angle range. A dotted and solid line respectively indicates the rock thickness and the flux calculated by assuming an average rock density of 2 gcm−3.