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Country: France, 47
Date: C15
Symmetry symbol: 4m
Symmetry symbol Schoenflies: C4v
Symmetry absolute number: 5
Agen, cathedral
The middle rose window on the facade
Symmetry comment: The outer circle is 4mm but the inside is only 3-fold (triskelium). Contrast makes this window unique
Photograph by: http://www.flickriver.com/groups/629028@N22