A method and device to detect and compare changes in atrial rate and morphology can be used to identify left atrial sense and capture, such as from a quadripolar or other lead located in or around the coronary sinus. In certain embodiments, a composite face plate for a club-head is formed with a cross-sectional profile having a varying thickness. The lens is fixed on the lens bonding member through an adhesive layer. The function set H\u0394 is such that the number of h\u03b5H \u0394 which satisfies h\u2212h=d for an arbitrary element d of the output data set B and two different elements x and y of the output data set B is equal to or smaller than |H\u0394|\xb7\u03b5. The gas that is generated in the combustion chamber after the gas generating material has been activated acts upon a projectile via the outlet opening of the combustion chamber, which projectile is accelerated by the gas pressure and destroys the outlet membrane, whereby the gas mixture consisting of the gas generated and the stored gas escapes from the outlet opening. Additionally, the given subset of the positive features includes two or more of the positive features.