Input files separated by blanks [idXML]Optional input file. IDs from 'in' are added to this file, but only if the (modified) peptide sequences are not present yet (considering only best hits per spectrum). [idXML,opt.]Output file [idXML]The text sent to standard out during the execution of IDMerger.The text sent to standard error during the execution of IDMerger. (If it appears in gray, it's the output of a previously failing run which is preserved for your trouble shooting.)