Psi Spectrum allows the user to draw a custom potential directly on a graph. From the ‘Potential’ menu, choose ‘User Drawn’. Begin drawing the potential on the graph by left clicking on the graph at the first vertex. A horizontal line will be drawn from the left most point of the graph to the point where you have just clicked. Moving to another point and clicking will connect another line between the two points. You must proceed from the left to the right. Clicking at a point further left than the previous point will not connect a line between the two points. When you have finished drawing, click the right mouse button and a horizontal line will be drawn from the point of your last vertex to the right-most side of the graph.