The beating signals obtained from an iPS cell-derived CM. A: The classification of beating phases. The time between each individual beat is marked with I. Contraction movement is defined as negative movement (marked with II) and relaxation movement as positive (marked with III). B: An enlarged image of the sector 8 radial component. C: The beating signals of each sector obtained from one of the measured CMs. For various sectors, the contraction seems to push certain areas away from the perceived beating focus point. This results in an upward peak in lieu of a downward peak due to the fusiform nature of the beating. While most sectors produce a signal of high quality, sectors such as radial 5 have too little movement to generate a well-formed displacement signal.