R-matrix with time-dependence calculations for three-sideband RABBITT in helium A. T. Bondy, J. C. del Valle, S. Saha, K. R. Hamilton, D. Bharti, A. Harth and K. Bartschat Eur. Phys. J. D, 78 8 (2024) 106 Published online: 14 August 2024 DOI: 10.1140/epjd/s10053-024-00900-z