Frequency spectra (black solid curve) from TESS data. The frequencies of the rapid EW_V/EW_R cycles for these stars are indicated by solid red vertical lines, and spectroscopic pulsational frequencies are indicated by dotted blue vertical lines. The green (red) shaded region is the rotation (orbital) frequency range determined from the parameters of Zorec et al. (2016). The red vertical dotted line for κ CMa is the “secondary frequency” from Rivinius et al. (2003) that may be circumstellar, and likewise for λ Pav from Levenhagen et al. (2011).