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We discuss the extended on-mass-shell scheme for manifestly Lorentz-invariantbaryon chiral perturbation theory. We present a calculation of pion photo- andelectroproduction up to and including order $q^4$. The low-energy constantshave been fixed by fitting experimental data in all available reactionchannels. Our results can be accessed via a web interface, the so-called chiralMAID (http://www.kph.uni-mainz.de/MAID/chiralmaid/).

Pion Photo- and Electroproduction and the Chiral MAID Interface