In both sports, the goal structure consists of a crossbar suspended 10 feet (3.0 m) off the ground and goal posts (colloquially known as "uprights") placed 18 feet 6 inches (5.64 m) apart and extending at least 35 feet (11 m) above the crossbar. In lower levels of play the goal posts may be placed further apart and/or not extend as far above the crossbar; for example, in high school football the posts are 23 feet 4 inches (7.11 m) apart. NFL and CFL rules mandate that a ribbon be attached to the top of each goal post.[17][18] Goals are centered on the field, but on different lines: in American football, they lie on the "end line" (far end of the end zone) and in Canadian football, on the "goal line" (beginning of the end zone).