Example for the estimation of the polynomial order for the detrending of the S_MWO time series of HD 43162: the upper panel shows the maximal power p(ω), the panel below the results of the F-test, where the significance of the scatter reduction is compared to the residuals of the non-detrended time series, the third panel shows the significance of the scatter reduction compared to detrending with the polynomial fit of order N-1 and in the lowest panel we plot the estimated periods; the dotted lines show the formal 1σ limit.