When we did this we had someone come in to help us with the creation of the curves. They started out in the pressroom reading linear sheets. My understanding...though limited...is Actual represents what your press gain actually is...and Desired is used for what you want it to be. I had limited involvement with the whole process and was only present to help insert figures into Rampage, which were given to me by the gentleman who profiled our presses. Hope this helps a little.