A simulation is used to study the impact of the gridding on the power spectral densities of the input signal and noise. We randomly placed 1024 point sources with different intensities on the sphere. To generate the “measured” input signal, the true point-source signal is convolved with a PSF of and sampled on about 50 million random coordinate pairs. Independent Gaussian noise is added to each resulting signal sample. Using a Gaussian-shaped gridding kernel with the input signal and noise are then imaged to the nside=512 HEALPix grid.