Distribution of the perihelion parameters from the resampled data for five selected objects (columns). Rows from top to bottom: t_ph, d_ph, v_ph. The vertical coloured bars show the three perihelion estimates discussed: the mean of the distribution (blue); the perihelion parameter obtained from using the nominal data (green); the perihelion parameter obtained from the linear approximation method (red). These are sometimes invisible as they coincide with other lines.