> Interesting links... But every single one talks about endurance
> exclusively, not one mention of data retention. :(

I did say "eg". If you look around MChip you'll find others

eg <<<----- !!!!!

TB072

http://ww1.microchip.com/downloads/en/AppNotes/91072a.pdf

and Go ogle on the web

eg <<<----- !!!!!

http://www.seas.upenn.edu/~ese570/1244.pdf

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