[aerohead]

*I've been working with a 'modified' 'Template' since early year.
*It is based on the upper half of Daugherty and Franzini's 2.5:1 teardrop published in their FLUID MECHANICS text of the 1970s.
*I posted it on page 37 of this thread at #366 (permalink).
*If you rotate the image counter-clockwise,then use only the upper half (Upper and lower halves are asymmetrical),this upper half becomes the basis for the 'new' 'Template.'
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*This 'new' contour addresses some of the criticism of the primary curvature of the 'Template,' and after working with dozens of comparisons I'm now confident that it is an 'improved' version,allowing,as you'll see,a bit more radical slope in the early stage of roof down-slope,which puts a more flattering light on the aft-bodies of many production automobiles and pickups.
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*Everything else remains essentially the same.
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*I'll scan the new image an post this coming Saturday.For those of you computer-savvy members,you can just overlay the new contour onto the existing 'Template.'
P.S. As always,we're concerning ourselves only with the aft-body portion of the contour as a means to prevent flow separation where it's most prone to occur.