Figure 6
From: A new cylindrical borehole detector for radiographic imaging with muons
Expected (top) and measured (bottom) free sky rates with the detector placed vertically; the plots are obtained using the software ROOT and the smoothing tool Contour4 is applied. Due to the very low geometrical acceptance, the zenith angular region between \(0^\circ \) and \(10^\circ \) is not shown.
