Simultaneous recordings of tracings 2cm above the LV apex, showing the typical recordings obtained in the maximal fiber direction of the epicardial (ascending) and endocardial (descending) muscle, compared to the right ventricular wall. Note the (a) earlier origin and termination of contraction in the descending segment, (b) similar starting point for RV contraction, and (c) later origin and end of shortening in the ascending segment. Upper left corner circle shows the crystal angulation, as described in the text.