This is BibTeX, Version 0.99d (TeX Live 2017/Debian)

Capacity: max_strings=100000, hash_size=100000, hash_prime=85009

The top-level auxiliary file: plot.aux

I found no \citation commands---while reading file plot.aux

I found no \bibdata command---while reading file plot.aux

I found no \bibstyle command---while reading file plot.aux

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83 strings with 482 characters,

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(There were 3 error messages)