Comparison between the bright (A, blue) and faint (B, orange) branches of the bifurcation at different (Strip sample). Top panels a–d: histogram of (black line) corresponding to the stars that fall in the range of , from left to right, [90°–100°, 100°–110°, 110°–120°, 120°–130°]. We also show the weighted histograms for each branch, which highlight the stars that contribute to compute the means plotted in the panels below. Panele: we plot the weighted mean heliocentric distance, after subtracting the median distance, and the associated error. Panelsf and g: weighted mean and its error for the proper motion in right ascension and in declination, respectively. Here we also subtract the median value of the bin to cancel the overall gradients.