Mass detection limits for an inner planet without assuming coplanarity with AB Pic b. The pink curve shows the estimated mass and orbital distance from the HIPPARCOS–Gaia proper motion anomaly (PMa), the blue area represents the SPHERE detection limits (DI), and the green area represents the RV detection limits from Grandjean et al. (2020) to give a rough idea of the inner regions that we can exclude. The semi-major axis and mass of AB Pic b are show by the white point.