Latitudinal profiles of kT_LHB with their 1 σ error bars in all longitudinal stripes of 15° width in the western Galactic hemisphere. The vertical orange, red and blue lines show the corresponding monopole, dipole and l_max = 6 models, respectively. The black region indicates the Galactic plane region, which we masked for the temperature gradient analysis. Regions plotted on the white background indicate where the dipole model was fitted (|b| > 30°). The l_max model was fitted with the inclusion of data from the shaded region (|b| > 10°).