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Mean dose difference between RSG and CRDG for a target located at various cardiac substructures. The location is specified at the title of each subplot. Red bars show dose difference between RSG and CRDG phase at diastole (0%). Gray bars show dose difference between RSG and CRDG phase at systole (40%). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
