Dear Users In gromacs 4.0, in file force.c in function make_bonded_tables line (1007) sprintf(tabfn + strlen(basefn) - strlen(ftp2ext(efXVG)) - 1,"_%s%d.%s", tabext, i, ftp2ext(efXVG)); produces table_bonded_bonded.xvg instead of table_bonded.xvg Greetings Andrzej Rzepiela