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    Re: Position lines, crossing.
    From: Fred Hebard
    Date: 2006 Dec 11, 00:01 -0500

    One comment about the smudge of position centered in the cocked hat,
    is that the probability of location diminishes with distance from the
    center; graphically, the "smudge" is darker in the center and fades
    to white toward the outside.  The gradient need not be the same in
    all directions, for instance, in a highly asymmetric cocked hat.
    
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