VMS Help FORTRAN, Error Messages, Run Time Errors, General, FLTUND  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  NUMBER:  74

  ERROR CODE:  F, C

  MESSAGE TEXT:  arithmetic trap, floating underflow

  EXPLANATION:  During an arithmetic operation a floating-point value
  became less than the smallest representable value for that data
  type and was replaced with a value of zero.