1. In a programmed system having a memory, a method for conducting an electrophysiology procedure using one or more catheters at least one of which includes: one or more first means supported on the catheter for obtaining physiologic data; and one or more second means for obtaining location data concerning a location of the first means when the catheter is positioned indwelling, the method comprising the steps of: a) displaying the location data obtained by the second means in a first window; b) displaying the physiologic data obtained by the first means in a second window; c) freezing the first and second windows to a first moment in time during the electrophysiology procedure in response to operator action; d) disassociating in the memory of the programmed system any physiologic data from location data for any moment in time other than the first moment in time; and e) creating a set of data points for display in the first window, each data point associating the physiologic data obtained by each first means at the first moment in time with the location data obtained by the second means at the first moment in time.