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. 2021 Mar 19;11:620978. doi: 10.3389/fonc.2021.620978

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Copyright © 2021 Sharfo, Rossi, Dirkx, Breedveld, Aluwini and Heijmen

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Four principle beam directions, characterized by (gantry angle, couch angle), from Figure 2 , used to develop the final class solution for VMAT+CS. This final CS consisted of directions C and D.