Generalized Lomb–Scargle (GLS) periodograms of α Cen B derived from the when using (solid black line; this solution is the same reported in Fig. 4 as the dash-dotted blue line). The GLS periodograms derived from the when using D = 2, 3, and 5 are displayed as a dotted blue line, a dash-dotted orange line and a dashed red line, respectively. The x-axis uses the base-10 logarithmic transformation of the period in order to improve the readability of the plot. The cv values for are displayed as black, blue, orange and red lines for the cases D = 4, 2, 3, and 5, respectively. Although the rms of for the considered cases are not statistically different, the bp-optimal solution () leads to the smallest cv.