Distribution of the fitted V_rot and PA_kin in one radial bin obtained from 1000 PN subsamples extracted for NGC 0821 and NGC 3379 (gray histograms). The red curves are Gaussians centered on the V_rot and PA_kin fitted on the full dataset, and with dispersion given by the Monte Carlo simulations of the galaxy under study. The vertical solid lines show the position angle of the photometric major axis for the two galaxies; the dotted lines show the photometric minor axis. The values for PA_phot are listed in Table 1.