CLEAN periodograms for EWs of various spectroscopic lines. Top: periodograms for lines being influenced by the circumstellar environment (solid – Hα; dashed – He i λλ6678.2; dotted – He i λλ4921.9). Bottom: periodograms for purely photospheric lines (solid – O iii λλ5592.3; dashed – C iv λλ5801.3). Dominant frequencies found in the individual BRITE photometry are marked in blue (from left to right: f_env, f_rot, 2f_env, f_env + f_rot, and 2f_rot).