"Identiﬁcation of neon ionization processes in the core-core (left) and core-valence (right) correlation regions." The top of the autocorrelation line is cut off to show the features behind. Symbols P, D, and A denote, respectively, ejection of a photoelectron, two photoelectrons (direct double photoionization by a single photon), and an Auger electron. The two detected electrons giving rise to the covariance signal are indicated by bold type.