The face of the stub end conforms to the gasket face of the flange. The "fishtail" design of ejector exhaust stub gave way to ones of circular section. Each of these stub functions contains a trap to the OS function. A mast decoupling stub reduces mast currents. Fuel tanks can be attached to pylons on stub wings. Distributed-element circuits often use the component known as a stub. Everything else is defined as a stub. A common length for stub cards was 51 columns. The tail is docked to a short stub in those countries that permit docking. This column is called "stub column". A 21 column card was comparable to the IBM Stub card. Another technique for debugging programs remotely is to use a "remote stub". A simple method of impedance matching is stub matching with a single stub. Both implementations are highly incomplete and consists mostly of stub functions. This avoids the need for additional proxy/stub projects for marshalling out-of-process.