A medical system, comprising: a catheter configured to be inserted into a chamber of a heart of a living subject, and including a distal end comprising catheter electrodes configured to contact tissue at respective locations within the chamber of the heart; at least one position sensor (50A, 50B) configured to provide at least one position signal indicative of a position of the distal end; a display; and processing circuitry configured to: compute the position of the distal end of the catheter responsively to the at least one position signal; assess a respective quality of contact of each of at least a sub-set of the catheter electrodes with the tissue; render to the display a three-dimensional anatomical map of the chamber of the heart and a 3D representation of the distal end of the catheter; select multiple intracardiac electrogram (IEGM) traces, representing electrical activity in the tissue that is sensed by respective ones of the catheter electrodes, to be rendered to the display, responsively to the respective quality of contact of each of the respective ones of the catheter electrodes with the tissue of the heart at the respective locations; and render to the display the selected multiple intracardiac electrogram (IEGM) traces, wherein the processing circuitry is configured to select the multiple IEGM traces representing electrical activity in the tissue that is sensed by n respective ones of the catheter electrodes responsively to the respective quality of contact of each of the n respective ones of the catheter electrodes with the tissue of the heart being among n highest qualities of contact of the at least sub-set of the catheter electrodes. a catheter configured to be inserted into a chamber of a heart of a living subject, and including a distal end comprising catheter electrodes configured to contact tissue at respective locations within the chamber of the heart; at least one position sensor (50A, 50B) configured to provide at least one position signal indicative of a position of the distal end; a display; and processing circuitry configured to: compute the position of the distal end of the catheter responsively to the at least one position signal; assess a respective quality of contact of each of at least a sub-set of the catheter electrodes with the tissue; render to the display a three-dimensional anatomical map of the chamber of the heart and a 3D representation of the distal end of the catheter; select multiple intracardiac electrogram (IEGM) traces, representing electrical activity in the tissue that is sensed by respective ones of the catheter electrodes, to be rendered to the display, responsively to the respective quality of contact of each of the respective ones of the catheter electrodes with the tissue of the heart at the respective locations; and render to the display the selected multiple intracardiac electrogram (IEGM) traces, compute the position of the distal end of the catheter responsively to the at least one position signal; assess a respective quality of contact of each of at least a sub-set of the catheter electrodes with the tissue; render to the display a three-dimensional anatomical map of the chamber of the heart and a 3D representation of the distal end of the catheter; select multiple intracardiac electrogram (IEGM) traces, representing electrical activity in the tissue that is sensed by respective ones of the catheter electrodes, to be rendered to the display, responsively to the respective quality of contact of each of the respective ones of the catheter electrodes with the tissue of the heart at the respective locations; and render to the display the selected multiple intracardiac electrogram (IEGM) traces, wherein the processing circuitry is configured to select the multiple IEGM traces representing electrical activity in the tissue that is sensed by n respective ones of the catheter electrodes responsively to the respective quality of contact of each of the n respective ones of the catheter electrodes with the tissue of the heart being among n highest qualities of contact of the at least sub-set of the catheter electrodes.