public Box createBox(TeXEnvironment env) {
    Box sp = new StrutBox(coeff * thin.createBox(env).getWidth(), 0, 0, 0);
    HorizontalBox db = new HorizontalBox(sp);
    db.add(ldotp.createBox(env));
    db.add(sp);
    Box b;
    if (w != 0) {
      float dw = db.getWidth();
      b = new HorizontalBox(db);
      while (b.getWidth() < w) {
        b.add(db);
      }
      b = new HorizontalBox(b, w, TeXConstants.ALIGN_CENTER);
    } else {
      b = db;
    }

    b.type = TeXConstants.TYPE_MULTICOLUMN;
    return b;
  }