Plotting the Common CMY NPDC Curve

I try to plot the common CMY NPDC Curve that I have a lot of questions.

1)Why? the CMY NPDC has only one curve?
2)Where Do I find the G7 ideal densities?
3)Where Do I find the neutral density formula ?

Thanks in advance

The G7 How To Guide is a free download from the IDEAlliance website’s “Publications” page:

This should answer all your questions. It has a lot of good information in it.

Ok, I got it.