Sorry I didn't get back to you yesterday, but things were hectic. Is it possible to have the depression be curved down instead of flat so it's more of a continuous wave? Still with the total difference in height being about 1.5-2 inches. that might male it more of a parabolic curve than a true radius (if i have my terminology correct) connecting the peaks and troughs. like a series of dimpled waves. I will try the first steps you gave me to see what I come up with-- THANKS-- Jack |