Please be sure to inform the instrument team of any technical issues you encounter during your run, either by emailing lisa(at)saao.ac.za, or by means of the SAAO's online fault forum.
'''If the slit runs anything but horizontally across the rear-of-slit image, the camera needs relocatingmechanical relocation* Fiddling with the USB cable can disrupt the physical position The rear-of the -slit camera, which is on has a spring-loaded kinematic mountwhich can move slightly if the USB cable snags or the camera gets bumped somehow* If this happens, the slit image will be displaced, making acquisition difficult* Insert the rear-of-slit mirror and turn on the slit-illumination to confirm that this is indeed the case
* Go out and grip the rear-of-slit camera assembly and gently jiggle it - the camera will pop back into its required position
* Verify with Use the slit illumination to verify that the slit runs horizontally across the image again
'''If the rear-of-slit camera window does not produce any images (though the exposures seem to count down), it probably needs a reset'''