The absolute values of projected stellar obliquity ﹩\left|\lambda \right|﹩ against host star age. Planets in single-planet systems are marked in black while those in multiplanet systems are marked in red. Host stars having effective temperature lower and higher than 6100 K (Kraft break; R. P. Kraft 1967) are, respectively, marked by circles and squares. More specifically, TOI-942c is highlight1ed by red edge. Different obliquity-exciting mechanisms on different timescales are marked by dashed lines in different colors, e.g., Kozai–Lidov mechanism, with a timescale shorter than a hundred Myr, and secular interaction, with a timescale in the magnitude of hundred Myr. Tidal realignment, which operates after a few hundred Myr, is shaded green with darker color indicating a stronger effect.