<table>
  <tr>
    <th></th>
    <th *ngFor="let h of headers">
      {{ h.label }}
    </th>
  </tr>
  <tr *ngFor="let row of rows; index as i">
    <td>{{ i }}</td>
    <td *ngFor="let h of headers">
      {{ row[h.source] }}
    </td>
  </tr>
</table>
