Scatter plots between sarcomeres at the same longitudinal positions in neighboring myofibrils in an LV myocyte of a mouse with normal systolic function. Data from M1 and M2 in Fig. 3 A during six cardiac cycles are shown for sarcomeres located at the same longitudinal positions (i.e., nos. 1–30; 79 plots for each sarcomere). Longitudinal position is shown on top of each graph. X axis, individual SL in M1; y axis, individual SL in M2. Number in graph indicates CI.