After screwing around for a half hour, I sort of figured out how to use it and have gotten far enough to know I'd better use my i1Qisplay Pro. When I got my Dell U2413 I was reluctant to do the hardware cal because of the sparseness of the LUT points, but this Aardenburg thing has convinced me that at the very least, the factory aRGB has a squashed tone curve, so thank you , Mark.