Yes a good article with just a few errors. "A couple years later, CinemaScope reduced the ratio slightly to 2.35:1 in order to fit an additional audio track onto the film prints for stereophonic sound." That was to add a mono track. The four track stereo sound was already on the film when it was 2.55. "Other rival formats included VistaVision (designed for flexible projection at either 1.66:1, 1.85:1 or 2.0:1), ToddAO 65mm (2.20:1) and three-strip Cinerama (approximately 2.89:1, projected onto a giant 146º curved screen)." Cinerama was 2.59.