Subscripts

 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).