Error distribution of the equi-cylindrical projection interpolation and of Flints. We represent the measured error distribution of the temperature ( T, left panel) and one plane of polarization ( Q, right panel) map. We use N _side = 4096 and ℓ _max = 4096 and no multiplication factor for the ECP method. The error distribution is computed by taking the difference of the value predicted by the interpolator to the exact value computed using the ECP method. In black (red) solid line, we represent the error distribution of our Flints (ECP interpolation) algorithm.