723839.fig.003a
(a)
723839.fig.003b
(b)
723839.fig.003c
(c)
723839.fig.003d
(d)
Figure 3: Histogram of helium isotopic ratio measured in volcanic gases and olivines from the islands of Pantelleria, Linosa, and Ustica ([6, 24], and this work), Mts Hyblei ([25], Etna [46, 2628], and Subcontinental Lithospheric Mantle [2932]).