Posteriors for the curvaton dipolar modulation model parameters κ and ξ. Contours enclose 68% and 95% of the posteriors. The model can explain the well-known dipolar asymmetry: note the preference for ξ > 0 in the asymmetry constraint (red contours and curves). However, the modulation preferred by the asymmetry constraint is reduced substantially when the isotropic constraint (blue) is added (black). The asymmetry constraint here uses SMICA, while the isotropic constraint uses Planck TT,TE,EE+lowE+lensing. Resolution is reduced at very small κ due to the sampling in βiso.
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