Do not attempt to do anything you have not been trained to do by ePSIC staff.
In order to run the COSMO corrector the sample must have areas of thin amorphous material. Any lattice in the image may interfere with the aberration calculation.
If sample contaminates significantly the aberration correction may fail. If possible beam shower the sample.
Using the z-piezo drive set defocus to about -200nm.
When super-fine is selected on the trackball goniometer control, the "diff-focus" dial on the right hand panel controls the z-piezo drive.
Set the tableaux angle to the required level (recommended to start at ~20 mrad) and run a tableaux.
Correct for higher order aberrations.
Iterate 4-7 as required.