Empirical quadratic LDCs of TOI-270. The fitted LDCs from the transit of TOI-270 b and d are shown in blue and orange, respectively. The LDCs obtained from the transit of TOI-270 d are shown with a small wavelength offset for clarity. The red curves show the quadratic LDCs predicted by the ATLAS9 stellar atmosphere models, obtained from ExoCTK. As can be seen, we find some potential differences between the empirical and theoretical LDCs.