{# The two views of one calculation: its ground-state orbitals, and the
excitons built out of them. Both pages include this so the pair is always in
the same place in the header.

`view` says which page is showing ('orbitals' or 'excitons'); `excitations` is
the calculation's excited states, empty for a ground-state run - there is then
nothing to switch to, so the whole pair is left out rather than drawn with
Excitons disabled. #}
{% if excitations %}
<span class="view-switch" role="group" aria-label="View" data-tour="view-switch">
    <a class="view-switch-option{{ ' active' if view == 'orbitals' }}" href="/{{ id }}"
        title="The ground-state molecular orbitals of this calculation, and the momentum map of each">Orbitals</a>
    <a class="view-switch-option{{ ' active' if view == 'excitons' }}" href="/{{ id }}/exciton"
        title="The excited states of this calculation: the Dyson orbital each photohole emits, and the maps and spectra that follow from it">Excitons</a>
</span>
{% endif %}