Correlations between several observables for the sub-sample of 720 stars with accurately determined photometric variability in TESS data. The panels investigate photometric peak-to-peak amplitude versus de-reddened colour index (BP − RP)₀ (upper-left panel), logarithmic distribution of rotation periods versus de-reddened colour index (BP − RP)₀ (upper-right panel), logarithmic distribution of rotation periods versus logarithmic photometric peak-to-peak amplitude (lower-left panel), and logarithmic distribution of rotation periods versus intrinsic absolute magnitude in the G band (lower-right panel). The blue lines illustrate a linear regression fit to the data. Coefficients and p values from the regression analysis are indicated in the insets.