An airfoil for a gas turbine engine includes a generally radially-extending first cooling channel disposed between pressure and suction sidewalls adjacent the leading edge of the airfoil, and a generally radially-extending second cooling channel disposed aft of the first cooling channel. The bonus game enables the player to select an award offer from a plurality of award offers. Other improved features of a parallel opening hinge are also described. The processing component also determines a position of the detected object using the selected at least three pairs of receivers and transmitters.