My interest is in the science of the golf swing. About 10 years ago, Titliest (International Golf Company) did very comprehensive swing measurements of 3 very well known professional golfers. They then used these measurements in software simulations, website publications, etc., to purport to explain how the swing works. The measurements are presented in about 50 graphs. Taking these measurements requires very expensive and sophisticated equipment which I don't have access to. They have not been successful in explaining the swing because, I believe, they have interpreted the measurements incorrectly. I have come to different conclusions by using my own modelling techniques together with their measurements graphs. I am writing a book, hopefully for profit, that would, in part, compare and interpret their graphs with my own research. I understand that the graphs as published in their software, website, papers etc. would be subject to copyright but what of the data measurements? Can I redraw those graphs (using their data) and present them differently? Can the measurement data be considered as fact and therefore not subject to Copyright?