In one embodiment, the medical system includes a catheter, a display, and processing circuitry including catheter electrodes inserted into the atrioventricular chamber of a heart of a living subject and contacting tissue at respective locations within the atrioventricular cavity of the heart, the processing circuitry Receiving signals from the catheter, in response to the signals, sampling respective voltage values of the signals at respective timing values, and indicating electrical activity in the tissue sensed by the catheter electrodes at respective locations on the display. Renders intracardiac electrocardiogram (IEGM) presentation strips, each of the IEGM presentation strips containing a linear array of respective shapes arranged in their temporal order and associated with each one of the timing values, and a filler of each shape. Are constructed in response to each of the sampled voltage values of each of the sampled signals at each of the timing values.
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