1. If the number is still red, you need to hit Enter for the program to know the new number!
2. If the parameters change while the Configure window is open, the window will not reflect the new numbers unless you hit the ``Revert'' button in the top middle. This mostly happens when one loads presets (not used in schrdgr).

• Potential at Bottom (Vbottom): the value of V(x) at the bottom of the square well (either infinite or shelf).
• Potential at Shelf (Vshelf): the value of V(x) on the shelf X > Xshelf for the square wells.
• Position of Shelf (Xshelf): the size of the bottom of the square well: V(x) equals Vbottom for 0 < X < Xshelf.
• Shrink energy y-axis by:Factor to shrink potentials by, so that they don't consume all the real estate of the graphs.
• Initial Psi at x=0: The starting value for at the left boundary X=0. For each of our problems, at X=0: the square-well potentials have V(x)=infinity for X < 0, and for the Hydrogen atom the trick that maps the three-dimensional problem to two dimensions also demands that as .
• Initial PsiPrime at x=0: Derivative of with respect to X at X=0. This actually doesn't matter to us, since we normalize the wave function. The ratio of Psi to PsiPrime is important in other problems.
• Spatial step delta_x (nm): How large a numerical step to take in solving Schrödinger's equation. If the program is too slow, try making delta_x larger; if you want better accuracy, make it smaller.

Statistical Mechanics: Entropy, Order Parameters, and Complexity, now available at Oxford University Press (USA, Europe).