Final

HERA was the first and only ep collider. It was in operation from 1992 to 2007 and the two collaborations ZEUS and H1 collected about 0.5 fb−1 of integrated luminosity each. Inclusive data from both collaborations were combined and used to determine the set of parton distribution functions called HERAPDF2.0. The history of HERA is presented as well as the long path to the final data combination and HERAPDF2.0. The proton remains full of wonders and parton distribution functions might have nothing to do with them. The legacy of HERA are the precise ep data which can be plotted as legacy plots