Lomb-Scargle normalized periodograms that we calculated for R Car (upper panels) and VX Sgr (lower panels). In the panels with diameters, we also highlight the false alarm probability (FAP; VanderPlas 2018) for levels of 1 and 10% (dashed gray and black lines) determined with astropy, which is one of the standard ways to judge peak significance. From our layers, usually only θ_cont and θ_{Ti I,Sc I} reach the 1% threshold and show peaks similar to the AAVSO light curve. For VX Sgr, the LS periodogram is shown for the full dataset and the quiescent cycle.