Fig. 1From: A study of “The Portrait of F.P. Makerovsky in a Masquerade Costume” by Dmitry Levitsky from the collection of the State Tretyakov GallerySampling pattern (red markers) and surface points examined by XRF (left); canvas rear (right); a the main part of the canvas, b the first extension piece, c the second extension pieceBack to article page