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Size distribution function of Gd3N@C80[DiPEG(OH)x] from DLS experiment. The mean peak position is 75nm, 76nm, 58nm and 37nm for Gd3N@C80[DiPEG350(OH)x], Gd3N@C80[DiPEG750(OH)x], Gd3N@C80[DiPEG2000(OH)x] and Gd3N@C80[DiPEG5000(OH)x] respectively.
