A medical apparatus, comprising: a probe configured for insertion into a body of a patient and comprising one or more electrodes configured to contact tissue of a region within the body; a display screen; a position-tracking system configured to acquire position coordinates of the one or more electrodes within the body; and a processor configured to: acquire respective electrophysiological signals from the one or more electrodes while the one or more electrodes contact multiple locations in the region; extract respective electrophysiological parameters from the electrophysiological signals; compute a respective measure of consistency of the respective electrophysiological parameters at each of the locations with respect to a weighted median of the electrophysiological parameters extracted at neighboring locations; and render to the display screen, responsively to the position coordinates, a map of the tissue while overlaying on the map a visual indication of the extracted electrophysiological parameters for which the respective measure of consistency satisfied a predefined consistency criterion, and automatically omitting from the map the electrophysiological parameters for which the respective measure of consistency did not satisfy the predefined consistency criterion. a probe configured for insertion into a body of a patient and comprising one or more electrodes configured to contact tissue of a region within the body; a display screen; a position-tracking system configured to acquire position coordinates of the one or more electrodes within the body; and a processor configured to: acquire respective electrophysiological signals from the one or more electrodes while the one or more electrodes contact multiple locations in the region; extract respective electrophysiological parameters from the electrophysiological signals; compute a respective measure of consistency of the respective electrophysiological parameters at each of the locations with respect to a weighted median of the electrophysiological parameters extracted at neighboring locations; and render to the display screen, responsively to the position coordinates, a map of the tissue while overlaying on the map a visual indication of the extracted electrophysiological parameters for which the respective measure of consistency satisfied a predefined consistency criterion, and automatically omitting from the map the electrophysiological parameters for which the respective measure of consistency did not satisfy the predefined consistency criterion. acquire respective electrophysiological signals from the one or more electrodes while the one or more electrodes contact multiple locations in the region; extract respective electrophysiological parameters from the electrophysiological signals; compute a respective measure of consistency of the respective electrophysiological parameters at each of the locations with respect to a weighted median of the electrophysiological parameters extracted at neighboring locations; and render to the display screen, responsively to the position coordinates, a map of the tissue while overlaying on the map a visual indication of the extracted electrophysiological parameters for which the respective measure of consistency satisfied a predefined consistency criterion, and automatically omitting from the map the electrophysiological parameters for which the respective measure of consistency did not satisfy the predefined consistency criterion.