By 'lined-up' I mean consistent Y axis, for both lines (green and red), no over-writing axis titles, or double labelling on y-axis and consistent origin. But I would like to have two sets of x axis labels (one red, one green) to show that there are two sets of years (one 19th century, one 20th century). Basically this is a popultion graph, with one line for each century. Drawing the lines themseles seems fine, its the axis labelling that's a problem.

Thanks!