Left panels: variation of the bar strength A₂ as function of the epoch is shown on the top panel, the standard deviation of the residual σ_res on the middle and the variation of the likelihood. The vertical dashed line indicates the epoch of the selected snapshot. Right panel: histogram of the residuals for Model-A at T = 2.0 Gyr, the red line is the best fit to the data and σ_res is the standard deviation of the residuals. The vertical dashed lines indicate the mean and standard deviation of the residuals.