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a Diagram relating the four materials of interest. b Powder X-ray diffraction data for MIL-100 (navy), Fe-BTC (orange), amMIL-100 (turquoise) and amFe-BTC (purple). Inset shows both amorphous materials. Data for MIL-100, Fe-BTC and amMIL-100 reproduced from Refs. 13,35. Data offset for clarity.