X-radiograph(s) of "Portrait of a Monk"

X-Radiograph Description: X-Radiograph Burroughs Number: 2989 X-Radiograph(s) of: Artist: Christus, Petrus, Netherlandish, ca. 1410-1475 or 1476 Title: Portrait of a Monk Date: 1446 ? Owner: Metropolitan Museum, New York (Bache Collection)