docs: function parse_Ref8U(blob) {
  	var rwFirst = blob.read_shift(2);
  	var rwLast = blob.read_shift(2);
  	var colFirst = blob.read_shift(2);
  	var colLast = blob.read_shift(2);
  	return {s:{c:colFirst, r:rwFirst}, e:{c:colLast,r:rwLast}};
  }