doc/info/figures/plotting22.mac

   1 plot3d (sin(2*theta)*cos(phi), [theta,0,%pi], [phi,0,2*%pi],
   2   [transform_xy,spherical_to_xyz], [grid,30,60], nolegend,
   3   [pdf_file,"./plotting22.pdf"]);
   4 plot3d (sin(2*theta)*cos(phi), [theta,0,%pi], [phi,0,2*%pi],
   5   [transform_xy,spherical_to_xyz], [grid,30,60], nolegend,
   6   [png_file,"./plotting22.png"]);