* <li>white if there is no consensus</li>
* <li>white if 'residue' is a gap</li>
* <li>dark blue if residue matches consensus (or joint consensus)</li>
* <li>white if there is no consensus</li>
* <li>white if 'residue' is a gap</li>
* <li>dark blue if residue matches consensus (or joint consensus)</li>