Main beam pointing directions measured with the first four Jupiter crossings. Single scans are yellow, light red, green, and light blue. First and second stacked scans are red, third and fourth stacked scans are blue, and four stacked scans are grey. The coloured boxes refer to the measured uncertainties magnified by a factor of 100. The differences in pointing were normalized to the J1 measurements, and were magnified by the same factor of 100. The U and V axis are defined as U = sin(θ)cos (φ) and V = sin (θ)sin (φ), where θ and φ are the angle respect the LOS (line of sight) defined in Tauber et al. (2010).