docs: function parse_RgceArea_BIFF2(blob/*::, length, opts*/) {
  	var r=parse_ColRelU(blob, 2), R=parse_ColRelU(blob, 2);
  	var c=blob.read_shift(1);
  	var C=blob.read_shift(1);
  	return { s:{r:r[0], c:c, cRel:r[1], rRel:r[2]}, e:{r:R[0], c:C, cRel:R[1], rRel:R[2]} };
  }