Left panel: amplitude of the dipole ﹩{ \mathcal D }﹩ (solid vertical line) in the CatWISE quasar sample vs. the expectation assuming the kinematic interpretation of the CMB dipole; the distribution of ﹩{{ \mathcal D }}^{\mathrm{sim}}﹩ from simulations (Section 3.2) is shown along with its median value (dashed vertical line). Right panel: dipole direction ﹩{\boldsymbol{ \mathcal D }}﹩ in Galactic coordinates (triangle), with the null hypothesis uncertainty region (2σ) in blue (Section 4). The probability under the null hypothesis of observing the dipole that we find is 5 × 10⁻⁷, or 4.9σ for a normal distribution (one-sided).