s are ordered on input.  The coordinates of
new data  values can then  be  stored  as  a linked triple (group/row,
variable/column, value).  Conversion from such a  component-wise input
scheme to a row or column based  storage scheme may be performed very
efficiently  if  desired   (see  [<A
 HREF="node57.html#DuffErisReid86">5</A>, pp30-31], and
subroutine MC39 in the Harwell Subroutine Library).

<P>
If a variable/column-wise input scheme is to be adopted, the data file
will contain a  <TT>GROUPS/ROWS/CON