docs: def md(self, text=TEXT, float_format="%.2g"):
          """ Generate Markdown from the table data. """
          cols = self._data.columns
          hl = pd.DataFrame([["---"] * len(cols)], index=["---"], columns=cols)
          df = pd.concat([hl, self._data])
          return df.to_csv(sep='|', index=True, float_format=float_format)