Top: continuum-subtracted phase-averaged EPIC-pn spectra of AM Herculis obtained in 2005 (left) and in 2015 (right) arranged as apparent trailed spectrograms. Only the region around the Fe-line complex is shown. The original data were arranged in 20 phase bins and energy bins of 5 eV. The color bars indicate spectral flux in counts s⁻¹ keV⁻¹. Bottom: line flux and equivalent widths of the neutral Fe-line as a function of binary phase. The same data are shown twice in all panels just for better visibility of repetitive features.