The radial wavefunctions of the first few states of the hydrogen atom are given by

The corresponding radial probability densities are

Where **n** and **l** are quantum numbers, **Z** is the atomic number, and **r** is the radius
(multiples of a_{0}).

To graph the wavefunctions enter the parameters (i.e., n, l, Z) and hit **New Plot**.
Up to 5 plots can be displayed at one time. The **Clear** button will remove all plots. To see the parameters
for each plot hit the **Legend on/off** button. The **Redraw** button will refresh the graph. This is useful when
the function domain (i.e., r ) has been changed. To pick off a value on the graph, move your cursor
to the desired location then click and hold. To toggle between wavefunction, wavefunction, and probability density click
the desired radio button.