Period spacing patterns for the three Pleiads with regularly-spaced gravity modes. The top panels show the frequency spectra with the extracted periods marked by crosses. The selected modes of the period spacing pattern are shown by solid orange lines. The best-fit asymptotic pulsation solution is indicated by dashed lines. The lower panel shows the observed period spacing pattern (crosses and solid line) together with the best fit (dashed) for f_rot and Π₀.