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Understood Cristian,
Have previously downloaded the two programs you mentioned. I was originally trying to use the Foucault test (with my own spreadsheet) to measure the mirror figure, as I could not get the Ronchi test to work for me. When I managed to get the Ronchi test working, I realised the extent of the TDE. This has been a very steep learning curve, but I am glad that I have had a go and am grateful for your expert advice amd patience.
Regards,
David.
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