How can I index TEM diffraction pattern rings using Digital Micrograph?

19 June 2020 0 9K Report

We have analyzed quartz samples in order to search for additional mineral phases and have obtained patterns like this above, but we weren't able to locate the centre neither using Ellipse Fitting Analysis nor by manual determination. How could I precisely locate the center using DiffTools and then determine d-spacings for each analysis?

Thank you for your time and attention!

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