| cirp | Counter ion repositioned |
| da | Dark-adapted |
| F | Fluorescence |
| la | Light-adapted |
| la1 | Light-adapted protonated retinal Schiff base ground-state |
| la2 | Light-adapted deprotonated retinal Schiff base |
| Pr | Probe |
| Prod | Photoproduct |
| cirp | Counter ion repositioned |
| da | Dark-adapted |
| F | Fluorescence |
| la | Light-adapted |
| la1 | Light-adapted protonated retinal Schiff base ground-state |
| la2 | Light-adapted deprotonated retinal Schiff base |
| Pr | Probe |
| Prod | Photoproduct |