Getting interval endpoints / time population size pairs

[zholzer]

Is there a way to get the exact x and y value for all times and population sizes respectively? I would like to be able to plot the exact outputs of the mean etc on a graph. Are the values outputted from the plot_helper the exact x and y values, or are they being smoothed for the graph? If they are not exact values, can I reconstruct the interval endpoints and respective population sizes somehow? Thank you!