The UV ring had 19 beamlines, while the X-ray ring had 58 beamlines. The beamlines were operated and funded in numerous ways. However, since the NSLS was a user facility, any scientist that submitted a proposal could be granted beamtime after peer-review. There were two types of beamlines at the NSLS: Facility Beamlines (FBs), which were operated by the NSLS staff and reserved a minimum of 50 percent of their beamtime for users, and Participating Research Team (PRT) beamlines, which were operated and staffed by external groups and reserved at least 25 percent of their beamtime for users.