Top: differences Δh (left) and dh (right) between the altitudes measured in Kassel and the altitudes that should have been measured according to modern data (Eqs. (17) and (18)). The solid lines show the best linear fit and its 3-rms range. Points outside this range were ignored in the fit. To the right of the dashed vertical line R_R = 0 and thus Δh = dh. Bottom: cumulative distribution of the difference between the measured Δh and dh and their best fit, compared with the distribution expected for a Gaussian with σ equal to the rms of the differences with the best fit. KS indicates the p-value from a two-sided Kolmogorov-Smirnov test for which the observed points are drawn from the Gaussian.