Planck CMB bispectrum detail in the signal-dominated regime showing a comparison between full 3D reconstruction using hybrid Fourier modes (left) and hybrid polynomials (right). Note the consistency of the main bispectrum properties which include an apparently “oscillatory” central feature for low-ℓ together with a flattened signal beyond to ℓ ≲ 1400. Note also the periodic CMB ISW-lensing signal in the squeezed limit along the edges of the tetrapyd.