Test on the Θ interval that corrupts the timing analysis. In this plot the powers of P₁ and P₂ resulting from Lomb-Scargle timing analysis are plotted as a function of the Θ interval removed from the data, where interval is indicated with horizontal error bars. While the power of P₁ is only affected very little and in a random way, the power of P₂ shows a systematic trend peaking at Θ = 0.5−0.6.