Ups and downs in the X-ray emission of the colliding wind binaries HD 168112 and HD 167971 G. Rauw, R. Blomme, Y. Nazé, D. Volpi and S. Fernandez-Vera A&A, 687 (2024) A197 Published online: 15 July 2024 DOI: 10.1051/0004-6361/202450158