The reveal is 1/16" according to this site: http://nrha.web-pros.com/How-To/floor_wall/moulding/molding.htm
"The casings are set back from the face of the jamb about 1/16" on either side; this "reveal" is almost unnoticeable, but it allows you to adjust the casing slightly if the window is not quite plumb. "
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