Arrays can be referenced by individual elements or by a range of
  elements (array sections).  A subscript list (appended to the array
  name) indicates which array element or array section is being
  referenced.

  In the subscript list for an array section, at least one of the
  subscripts must be a subscript triplet or vector subscript.

  VSI Fortran permits intrinsic noninteger expressions for
  subscripts, but they are converted to integers before use (any
  fractional parts are truncated).