th>
    <td ng-repeat="col in Cols" ng-class="{ formula: ( '=' === sheet[col+row][0] ) }">
      <input id="{{ col+row }}" ng-model="sheet[col+row]" ng-change="calc()"
       ng-model-options="{ debounce: 200 }" ng-keydown="keydown( $event, col, row )">
      <div ng-class="{ error: errs[col+row], text: vals[col+row][0] }">
        {{ errs[col+row] || vals[col+row] }}</div>
    </td>
  </tr></table>
</body></html>
