Scatter plots between average and individual SLs in an LV myocyte of a mouse with normal systolic function. Data from M2 in Fig. 3 A during six cardiac cycles are shown for sarcomere nos. 1–30 (79 plots for each sarcomere). X axis, average SL (average length of 30 sarcomeres); y axis, individual SL. Sarcomere number is shown on top of each graph. Number in graph indicates CI for each sarcomere (i.e., R between average and individual SL).