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“Simply Spherical” graph Simply Spherical  (zoom in)
This graph adorns the back cover of the GrafEq 2.02 manual. Although GrafEq 2.02 only presents two dimensional views of graphs, three dimensional graphs such as this can be fudged by modelling the half toning process within the equation.
inequalities for sphere portion of “Simply Spherical” graph

inequalities for shadow portion of “Simply Spherical” graph