## ###############################################################
  ## ### Version control history
  ## ###############################################################
  ## ### $Id$
  ## ### $Log$
  ## ### Revision 1.27  2005/03/21 10:34:47  gawthrop
  ## ### Tidied.
  ## ###
  ## ### Revision 1.26  2004/08/29 13:11:21  geraint
  ## ### Writes MTTyz vector in the same format as MTTx and MTTy: MTTyz($d,1)
  ## ##
  ## ### Revision 1.25  2003/01/07 18:09:21  geraint
  ## ### More informative error message.
  ## ##
  ## ### Revision 1.24  1999/10/22 02:20:32  peterg

  ## anything else is the name of a constant.
  ## Blank is taken to be external
  ## If its a numbered port:
  ##     cr contains 'MTT_port'
  ##     arg contains port number

  if (strcmp(cr,"SS"))		# Then its the standard file
    a = split(args,",")
    a = char(strsplit(args,","))
    [N,M]=size(a);
    if (N~=2)			# Must have 2 arguments
      mtt_error(sprintf("SS should have 2 args not %i", N));
    endif
    effort_attribute = deblank(a(1,:));
    flow_attribute   = deblank(a(2,:));
  else				# Old style file

  delim = "__";
  N = mtt_check_sigs (outsig,insigs);

  full_name = sprintf("%s%s%s", Name,delim,name);

  ## Get the special attibutes for SS
  attrib_name = split(arg,",");
  attrib_name = char(strsplit(arg,","));
  [N_a,M_a]=size(attrib_name);
  if (N_a~=2)		# Must have 2 arguments
    mtt_error(sprintf("SS should have 2 args not %i", N_a));
  end;

  effort_attribute = deblank(attrib_name(1,:));
  flow_attribute   = deblank(attrib_name(2,:));