From: "Mel Bartels" 
To: 
Reply-To: "Mel Bartels" 


>>>
and offer comment as to whether I need to get closer to a sphere before
starting to parabolise, I would be most grateful!
<<<

Don't worry about sphericity, do worry about smoothness.  If your figure is
relatively smooth, then you can start introducing parabolization into the
figuring.  I'd say you are ready for a shot at it.

Mel Bartels

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