A method, including generating a three-dimensional(3D) map as a plurality of points illustrating acharacteristic of a 3D heart chamber, the 3D heartchamber having an opening bounded by a perimeter. Themethod further includes transforming the perimeter into aclosed two-dimensional (2D) figure having an interior.The plurality of points illustrating the characteristicare projected onto the interior of the 2D figure so as togenerate a 2D map of the characteristic of the 3D heartchamber.
