<!-- Checkbox Column -->
<ng-container matColumnDef="select">
  <th mat-header-cell *matHeaderCellDef>
    <mat-checkbox (change)="$event ? masterToggle() : null"
                  [checked]="selection.hasValue() && isAllSelected()"
                  [indeterminate]="selection.hasValue() && !isAllSelected()"
                  [aria-label]="checkboxLabel()">
    </mat-checkbox>
  </th>
  <td mat-cell *matCellDef="let row">
    <mat-checkbox (click)="$event.stopPropagation()"
                  (change)="$event ? selection.toggle(row) : null"
                  [checked]="selection.isSelected(row)"
                  [disabled]="row.excluded">


    </mat-checkbox>
  </td>
</ng-container>