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$\begingroup$You have 200 data points, and so ListPlot gives you that axis. You want to have 2D points: ListPlot[Transpose[{Range[1, 20, .1], a}]]. This gives you a list of {x, y} pairs instead of a single list of values.$\endgroup$
ListPlot
gives you that axis. You want to have 2D points:ListPlot[Transpose[{Range[1, 20, .1], a}]]
. This gives you a list of {x, y} pairs instead of a single list of values. $\endgroup$