VMS Help FORTRAN, Data, Arrays, Subscripts  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  A subscript qualifies an array name.  A subscript is a list of
  expressions, called subscript expressions, enclosed in parentheses,
  that determine which element in the array is referred to.  The
  subscript is appended to the array name it qualifies.  A subscript
  has the form:

     (s[,s]...)     s is a subscript expression

  A one-dimensional array is stored with its first element in the
  first storage location and its last element in the last storage
  location of the sequence.  A multidimensional array is stored so
  that the leftmost subscripts vary most rapidly.