Left panel, top row: two realisations of the bi-dimensional density of probability in the age vs. β plane for twoartificial systems under scenario A, with median estimated β = 0.26. Second row: as in the top row but for median estimated β = 0.18. Third row: as in the top row but for median estimated β = 0.12. Bottom row:as in the top row but for median estimated β = 0.06. The shown probability densities correspond to eight artificially perturbed systems. Right panel: as in the left panel for scenario C; from top to bottom the estimated β are 0.16, 0.12, 0.06, 0.0. The crosses indicate the position of the reference β and age values.