A lithographic projection apparatus includes a support structure configured to hold a patterning device. Using one or more sensors, failures may be detected in the application. During the enhanced play mode, the awards attributed to each symbol combination are increased, and the game parameters, other than the award amounts may be changed. The following sequence of operations is then repeated: Output and reference images are displayed on a system monitor. A second connection point is connected to another end of the second transmission line. In the preferred embodiment, the first phase is a fluid stream comprising acid gases such as CO2, H2S, SO2, CS2, HCN, COS or mercaptans, and the second phase is an absorption medium which comprises an aqueous solution of at least one organic andor inorganic base.