A group wagering game is provided in which all entrants win or lose simultaneously as a group. A threshold can be identified for determining data from the first and second images to be used in computing the third image. For shelf-type display structures, cantilevering a flag above a base portion allows the marketing display insert to be inserted into the top of a price label fixture. The distances between an end of each of the sub-electron emitters away from the cathode electrode and a sidewall of the through-hole are substantially equal.