**Figure 2.** **1900 cohort Swedish mortality data fitted by the model of heterogeneous population composed of six subpopulations (panel A) and the Heligman-Pollard model (panel B).** The dots represent the observed central death rates, while the dashed curves in panel (**A**) indicate the exponential mortality dynamics of each subpopulation in the model of heterogeneous population and in panel (**B**) - the dynamics of the three components of the Heligman-Pollard model. Note that the plots are given in semi-logarithmic scale.