Three radii are called for in the type 557a wizard, however the image in the wizard clearly looks like it is asking for the diameter. Which one is correct? Thanks, Fred FRED BETZ PhD., LEED AP SUSTAINABLE SYSTEMS ANALYST AEI | AFFILIATED ENGINEERS, INC. 5802 Research Park Blvd. | Madison, WI 53719 P: 608.236.1175 | F: 608.238.2614 fbetz@aeieng.com | www.aeieng.com