Apparatus, comprising: a screen; and a processor configured to: receive a first set of electrophysiological signals indicative of a wave of electrical activation flowing through a region of a human heart prior to ablation; display an intermediate map of the human heart including a line corresponding to an abnormal wavefront, record parameters indicative of a quality of ablation performed at one or more sites in the region of the human heart, receive a second set of electrophysiological signals indicative of a wave of electrical activation flowing through the region after ablation, identify locations in the vicinity of the line within the region at which the wave is expected to be blocked from flowing, estimate confidence levels with respect to a blockage of the wave at the locations using the first and second sets of electrophysiological signals and the parameters, wherein a given confidence level at a given location is increased if an amplitude of a given electrophysiological signal of the second set of electrophysiological signals at the given location is lower than the amplitude of the electrical physiological signal of the first set of electrophysiological signals at the given location, and display a map of the human heart including an indication of the confidence levels on the screen, wherein the map includes a line which is based on said line corresponding to the abnormal wavefront, weighted by said confidence levels. a screen; and a processor configured to: receive a first set of electrophysiological signals indicative of a wave of electrical activation flowing through a region of a human heart prior to ablation; display an intermediate map of the human heart including a line corresponding to an abnormal wavefront, record parameters indicative of a quality of ablation performed at one or more sites in the region of the human heart, receive a second set of electrophysiological signals indicative of a wave of electrical activation flowing through the region after ablation, identify locations in the vicinity of the line within the region at which the wave is expected to be blocked from flowing, estimate confidence levels with respect to a blockage of the wave at the locations using the first and second sets of electrophysiological signals and the parameters, wherein a given confidence level at a given location is increased if an amplitude of a given electrophysiological signal of the second set of electrophysiological signals at the given location is lower than the amplitude of the electrical physiological signal of the first set of electrophysiological signals at the given location, and display a map of the human heart including an indication of the confidence levels on the screen, wherein the map includes a line which is based on said line corresponding to the abnormal wavefront, weighted by said confidence levels. receive a first set of electrophysiological signals indicative of a wave of electrical activation flowing through a region of a human heart prior to ablation; display an intermediate map of the human heart including a line corresponding to an abnormal wavefront, record parameters indicative of a quality of ablation performed at one or more sites in the region of the human heart, receive a second set of electrophysiological signals indicative of a wave of electrical activation flowing through the region after ablation, identify locations in the vicinity of the line within the region at which the wave is expected to be blocked from flowing, estimate confidence levels with respect to a blockage of the wave at the locations using the first and second sets of electrophysiological signals and the parameters, wherein a given confidence level at a given location is increased if an amplitude of a given electrophysiological signal of the second set of electrophysiological signals at the given location is lower than the amplitude of the electrical physiological signal of the first set of electrophysiological signals at the given location, and display a map of the human heart including an indication of the confidence levels on the screen, wherein the map includes a line which is based on said line corresponding to the abnormal wavefront, weighted by said confidence levels.