code: function write_Blxf(data, o) {
  	if(!o) o = new_buf(10);
  	o.write_shift(1, 0); /* dg */
  	o.write_shift(1, 0);
  	o.write_shift(4, 0); /* color */
  	o.write_shift(4, 0); /* color */
  	return o;
  }
docs: /* [MS-XLSB] 2.5.4 Blxf TODO