The first two plots depict the CMY gamuts measured measured on the computer monitor before and after calling the function, 'Convert to RGB' for both Engines along with the gamut of the printout.  It is obvious that the white point of our spectroradiometer has had an effect on our measurements.

The third plot shows the slightly different effects each engine has on the printout of this function.

The thin red line is our 'ideal gamut' associated with the full color spectrum.