►In Figure 36.3.13(a) points of confluence of phase contours are zeros of ; similarly for other contour plots in this subsection.
…
►
…
Figure 36.3.13: Phase of Pearcey integral .
…
►
…
Figure 36.3.21: Phase of hyperbolic umbilic canonical integral .
…
…
►In doing this, however, we would like to place the mathematically significant phase values, specifically the multiples of correponding to the real and imaginary axes, at more immediately recognizable colors.
…
►We therefore use a piecewise linear mapping as illustrated below, that takes phase
to red, to yellow, to cyan and to blue.
…