Figure 2: Synchrograms of a separate representative case. Here, three n:m ratios are shown, where n and m refer to the cardiac cycles and the respiratory cycles, respectively. The X-axis denotes the time-axis (second). The Y-axis denotes the number of respiratory cycles (m). The red vertical line denotes the event mark of the inhalation of Berotec. Upper panel: m = 1. Middle panel: m = 2. Lower panel: m = 3.