Comparison of the scaled fraction of variance f_sv values of the resulting light curve regression models obtained for the different pre-whitening strategies applied to the stars in the sample, with colouring as a function of f_sv. Each cell contains the f_sv value as computed using Eq. (3), as well as the total number of frequencies extracted using this approach, n_e. The number n_e and the f_sv value are computed after the frequency filtering step has removed any unresolved frequencies with respect to the LD78 criterion and any signals that have insignificant amplitudes (at 95% confidence), as discussed in Sect. 2.2.