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Diaphragmatic position during 2 representative breathing cycles. (a) Diaphragmatic position during 2 representative breathing cycles. (b) Corresponding histograms of the diaphragmatic position. The position with the highest number of counts was defined as EEP. The EED was defined as the number of counts within the EEP interval. The most distant position from EEP with at least 2 counts on the histogram was defined as the EIP.
