code: function parse_MulBlank(blob, length) {
  	var target = blob.l + length - 2;
  	var rw = blob.read_shift(2), col = blob.read_shift(2);
  	var ixfes = [];
  	while(blob.l < target) ixfes.push(blob.read_shift(2));
  	if(blob.l !== target) throw new Error("MulBlank read error");
  	var lastcol = blob.read_shift(2);
  	if(ixfes.length != lastcol - col + 1) throw new Error("MulBlank length mismatch");
  	return {r:rw, c:col, C:lastcol, ixfe:ixfes};
  }
docs: /* [MS-XLS] 2.4.174