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Elastically scattered X-ray beam at (a) Cu L- and (b) O K-edges from a carbon tape, fitted with Gaussian line-shapes of FWHM 35 and 16 meV, respectively. Insets show the achievable energy resolution at I21 for the three PGM gratings VPG1 (600 l/mm), VPG2 (1000 l/mm) and VPG3 (2000 l/mm) in combination with SGM gratings SVLS1 (1500 l/mm) and SVLS2 (2700 l/mm) at Cu L- and O K-edges.
