Rotational modulation in EPIC 201667495 (HD 107000). The detrended K2 light curve is shown in the top left panel. Bottom panel: amplitude spectrum calculated up to the K2 LC Nyquist frequency of 24.47 d⁻¹; the lower part shows the residual amplitude spectrum calculated after the rotational modulation signal was removed for comparison. We note the change in ordinate scale. The vertical red lines indicate the location of the extracted rotation frequency and of its significant harmonics, which were used to construct the rotational modulation frequency model. The vertical dashed grey lines indicate the location of integer multiples of the K2 thruster firing frequency of ν_thrus = 4.08 d⁻¹. The phase-folded light curve using the derived rotation period is shown in the top right panel with black circles indicating the K2 observations and the red line indicating the rotational modulation frequency model.