docs: function parse_RgceLocRel(blob, length, opts) {
  	var biff = opts && opts.biff ? opts.biff : 8;
  	if(biff >= 2 && biff <= 5) return parse_RgceLocRel_BIFF2(blob, length, opts);
  	var r = blob.read_shift(biff >= 12 ? 4 : 2);
  	var cl = blob.read_shift(2);
  	var cRel = (cl & 0x8000) >> 15, rRel = (cl & 0x4000) >> 14;
  	cl &= 0x3FFF;
  	if(rRel == 1) while(r > 0x7FFFF) r -= 0x100000;
  	if(cRel == 1) while(cl > 0x1FFF) cl = cl - 0x4000;
  	return {r:r,c:cl,cRel:cRel,rRel:rRel};
  }