Figure 6
From: Imaging of underground cavities with cosmic-ray muons from observations at Mt. Echia (Naples)
A half plane of 32 scintillator bars and 32 wavelength shifting fibres placed in a connector. The connector is optically coupled to 32 Silicon photomultipliers, mounted on a printed circuit board, not shown in the picture. Two half planes mounted side by side form a detection plane.
