A detailed X-ray investigation of ζ Puppis - IV. Further characterization of the variability Yaël Nazé, Tahina Ramiaramanantsoa, Ian R. Stevens, Ian D. Howarth and Anthony F. J. Moffat A&A, 609 (2018) A81 Published online: 16 January 2018 DOI: 10.1051/0004-6361/201730729