* '''Instrument''': SHOC, STE3 or STE4 (or your own instrument) will be mounted below the filter box.
*'''STE3/STE4''' has its own blue '''instrument Merlin crate''' mounted to the cylindrical dewar. There is a red reset button on the side of the crate that should be pressed if the instrument control software hangs, crashes or reports a "Merlin error". There is no need for observers to fill the dewar with liquid nitrogen; this is done by technicians in the morning and afternoon.* '''SHOC''' does not require liquid nitrogen; it is peltier-cooled. It has no Merlin crate. The control PC ("shocnawe" or "shocndisbelief" is mounted in a crate below the primary mirror cell.
=== Filters ===