NAME wfc_config, locate the default instrument data file, IDF. SYNOPSIS Each Wide Field Camera has its own instrument data file, IDF. A configuration file is used to match the FITS keys INSTRUME, TELESCOP and a user defined string U to listed values, and to assign the name of the instrument data file. The configuration file is build out of commentlines (starting with #) and lines consisting of 4 words, eg # this is a sample WFC configuration file. SAX WFC1 *lr wfc1.ins SAX WFC2 *lr wfc2.ins If the first column matches the value of the key TELESCOP, the second matches INSTRUME and the third matches a user defined string U (default value is "*lr"), the name of the instrument data file is in the fourth column. The crucial difference is of course in the fitskey INSTRUME, selecting the proper WFC. By default, the generated instrument data file specifies a celestial image resolution (pixelsize) derived from the maskelement size. The configuration file's full pathname can be given in the environment variable WFC_CONFIG. If this variable is undefined, the configurationfile used is $WFC_CAL/wfc_config.