This guide has been designed to make the reduction of EVN data as straightforward as possible. It assumes that the data being reduced by the user has been processed by the EVN user pipeline, a set of AIPS procedures that are used to automatically calibrate all data that emerges from the EVN MkIV Data Processor at JIVE. This produces a number of AIPS calibration tables that take care of, amongst other things, amplitude and phase calibration and thus simplifies the data reduction process. The pipeline also outputs a great number of plots that can be used to assess the data quality and spot problems. The final products of the post-correlation process are data files in the FITS-IDI format (since May 2002). These data as well as all pipeline plots involving a program source remain proprietary for a period of 12 months from the release of the data to the P.I.
The most comprehensive source of information for VLBI data reduction remains the AIPS Cookbook. Chapter 9 is devoted to VLBI data reduction. This, along with the AIPS internal HELP and EXPLAIN files, complements the information contained in the EVN data reduction guide and is particularly useful for data that have been processed at the VLBA correlator.