Fig. 4From: Development of a portable assembly-type cosmic-ray muon module for measuring the density structure of a column of magma(a) Vertical muon intensity versus depth (1 km.w.e. of standard rock). The experimental data are from: ⋄: the compilation of Crouch (Crouch, 1987), □: Baksan (Andreev, 1987), •: MACRO (Ambrosio et al., 1995). (b) Integrated flux of near-horizontal cosmic-ray muons at various zenith angles penetrating through a given thickness of rock.Back to article page