(5-12)  The picture below shows similar ψ2 graphs to those we had in figure V-vii. These are, you will recall, derived from superpositions, ψ, of sinusoidal curves, integrated over a range of k from 0 to kmax .  In this version, we focus on the dominant central peak and the graphs have been rescaled vertically, to make the peaks the same height:  this just makes it easier to compare what we're interested in, which is the horizontal spread of each peak.