UofC Troubleshooting On this page, we post images and other files that you can download to help us figure out problems we're having with our instruments. Vibration/Shim/Lineshape1 Size: 22 KB 1H lineshape standard: low-flip angl series, taken 2 min apart, showing ~2Hz noise. Vib'n? Shims? Vibration/Shim/Lineshape1 Size: 32 KB 1H lineshape standard: One of the series. Looks like shim prob, but unstable like vibn.