there is plenty of access into the crystal on the marresearch image plate system and although there is a temptation to mount the cryostream vertically over the horizontal goniometer one must be careful to avoid pointing the cold stream at the CCD camera pointing up from underneath . we recommend the user tilts the cryostream from 90 vertically to about 55 towards the goniometer housing . the position will depend on which side the user wishes to gain access to the crystal .it is also possible to invert the head in order to point the stream upward .