d></td>
      <td></td>
      <td></td>
    </tr>
    <tr>
      <th>fck_2d</th>
      <td>0.4**</td>
      <td>0.25**</td>
      <td>0.16**</td>
      <td>0.23**</td>
      <td>0.59**</td>
      <td>0.2**</td>
      <td>-</td>
      <td></td>
      <td></td>
    </tr>
    <tr>
      <th>fck_r</th>
      <td>0.34**</td>
      <td>0.19**</td>
      <td>0.1**</td>
      <td>0.17**</td>
      <td>0.54**</td>
      <td>0.13**</td>
      <td>0.07</td>
      <td>-</td>
      <td></td>
    </tr>
    <tr>
      <th