 ![0$\sigma$ errors as function of [HEALPix]{} $N_{\rm side}$ values for the parameters $A$, $b_0$, $l_0$, and $T_{0}$: dipole-only (solid black line); dipole+noise (green dot-dashed line); dipole+noise+mask (red dotted line); and dipole+noise+mask+systematics (blue dashed line). The chosen frequency channel is 00GHz and the noise map corresponds to 0.0$\mu$K.arcmin. The adopted mask is the [*Planck*]{} Galactic mask extended to cut out $\pm00^\circ$ of the Galactic plane. The systematics correspond to the pessimistic expectation of calibration errors and sky (foreground, etc.) residuals. Notice that the pixelization error, due to the finite map resolution, is dominant over the noise for any $N_{\rm side}$. While the impact of noise and systematics is negligible, we find that the effect of reducing the effective sky fraction is important.[]{data-label="fig:diperrors"}](dip_nside_