Fig. 3: Distributions of void radius formed from silicon atoms in SiO2 glass at high pressures.
From: Experimental evidence of tetrahedral symmetry breaking in SiO2 glass under pressure

a 0–2.2 GPa. b 2.3–3.5 GPa. c 4.4–6.0 GPa. The broken line at the void radius of 3.11 Å represents the ring size of a six-membered ring structure. The dotted line at the void radius of 3.75 Å is a guide for the eye. Source data are provided as a Source Data file.