# §36.3(ii) Canonical Integrals: Phase

In Figure 36.3.13(a) points of confluence of phase contours are zeros of $\mathop{\Psi_{2}\/}\nolimits\!\left(x,y\right)$; similarly for other contour plots in this subsection. In Figure 36.3.13(b) points of confluence of all colors are zeros of $\mathop{\Psi_{2}\/}\nolimits\!\left(x,y\right)$; similarly for other density plots in this subsection.