An outer debris pane, two 25 mm pressure panes, and an inner scratch pane. Each window assembly consisted of three thick panes of glass. Windows were often glazed with decorative leadlight or etched/sandblasted glass panes. Some window panes in Times Square were shattered. These are the pieces of framing that separate a larger window into smaller panes. Krypton is used occasionally as an insulating gas between window panes. Bevelled edges are a common aesthetic nicety added to window panes and mirrors. Many of the other window panes were also blown out. After passing , one of the outer Plexiglas window panes cracked, shaking the entire vessel. The Command Module featured five windows made of three thick panes of glass. SHGC also decreases with the number of glass panes used in a window. Projection surfaces can be many objects such as walls or glass panes. Original models had two beveled glass panes on each side. Five panes of glass were also broken. ITO is also used as the IR reflector for low-e window panes.