Smoothed binned signal-to-noise bispectrum ℬ for the Planck 2015 cleaned sky map, as determined with the binned estimator, as a function of ℓ₁ and ℓ₂ for a fixed ℓ₃-bin [518, 548]. From left to right results are shown for the four component separation methods SMICA, SEVEM, NILC, and Commander. From top to bottom are shown: TTT, TTT cleaned from radio and CIB point sources; T2E, TE2; and EEE. The colour range is in signal-to-noise from − 4 to + 4. The light grey regions are where the bispectrum is not defined, either because it is outside the triangle inequality or because of the cut .