A method, including collecting first data samples of electrical potentials produced by a heart at a sequence of sampling times, and collecting second data samples of ancillary data with respect to the heart at the sampling times. Based on the first and second data samples, a trace of the electrical potentials collected at the sampling times is presented, on a display, the trace having a pseudo-three-dimensional (3D) characteristic that varies responsively to the ancillary data collected at each of the sampling times.
