HIP98599 periodograms. Shown from top to bottom: RVs, model residuals, FWHM, BIS, and window function. FAP lines for 0.1, 1, and 10%, in dashed red, dotted purple, and dotted blue, respectively. Circle markers show the periods with greatest power, coloured by FAP region. Green vertical region shows P₁ = 2656${2656}_{-16}^{+40}$ d. On the right side there is a table summary of the five highest powers.