Confidence level measured from the region of the sky after 1 to 6 years of observations with the I_E band. Regions of 68% (dark gray), 95% (middle gray) and 99.75% (light gray). The left panel shows the uncertainty of the dipole amplitude, with the horizontal thick line indicating the expected amplitude for a velocity of V = 370 km s⁻¹. The right panel shows the uncertainty on the CMB dipole direction determination. The dipole is assumed to be in the direction of the Solar dipole, $(l,b)=(263\stackrel{°}{.}85,48\stackrel{°}{.}25)$ in Galactic coordinates.