Cardiac catheterization is conducted with a probe having a plurality ofsensors. The heart is displayed as a first graphic image. Signals from thesensors areprocessed according to a predefined algorithm to generate respective outputs,A region on the first graphic image that is less than all of the first graphicimageis selected according to locations of the sensors, and values derived fromoutputs of the sensors are displayed on the selected region as a secondgraphicimage. Thereafter, the second graphic image is removed and replaced by anupdated version.
