Fig. 2From: Free Volume Structure of Acrylic-Type Dental Nanocomposites Tested with Annihilating PositronsPAL spectra of non-polymerized Charisma-0 (black open circles) and polymerized Charisma-3 (red full circles) composites in semi-log presentation. The inset shows linearized comparison of annihilation events accumulated in the peakBack to article page