Illustration of the measured variability quantities in an example power spectrum of KIC002141150 during Q14. We use the interval between ν₁ and ν₂ (orange shaded region) as a representation of the starspot variability. The variance in the light curve caused by active regions is proportional to the integral of the power in this interval. The rotation rate at the spot latitude is measured by the centroid ν_C. The interval is centered on the average rotation rate ν_rot of the star, obtained from McQuillan et al. (2014). The blue region shows the first harmonic of the rotation period.