the cryostream should be mounted opposite the microscope , perpendicular to the x-ray beam path , at a fairly unrestricted angle of between 55 and horizontal (ideally about 45) . if the r-axis is fitted with both a ccd camera and a microscope , then one may need to be (re)moved depending on the amount of space available . if the cryostream is any steeper than 55 the goniometer may interfere with the laminar flow of the cold stream and cause icing to occur . the varibeam support stand is ideal for this application .