Reflection effect asymmetry in sdB+dM/BD binaries, as measured by the phase difference between the first harmonic and fundamental from Fourier series fits to TESS light curves. Top panel: phase differences are shown plotted against orbital period for individual eclipsing (red; HW Vir) and non-eclipsing (pink) binaries. Bottom panel: histogram of the measured phase differences with the same color coding. The gray lines mark 270°, which would result in a symmetric reflection effect. The green lines and shaded regions denote the peak of the empirical distribution and its uncertainty.