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Flowchart of the RMC-CBCT study design. RCCT(sim) denotes respiration-correlated CT at simulation; RCCT(tx) is acquired at treatment 13–20 days later. RMC-CBCT(sim) denotes correction derived from RCCT(sim); RMC-CBCT(tx) is derived from RCCT(tx). Gated CBCT is acquired at EE.