This is pdfTeX, Version 3.14159265-2.6-1.40.18 (TeX Live 2017) (preloaded format=pdflatex 2018.3.28)  8 MAR 2021 09:45
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
**plot_fit.texf
(/nfs/opt/texlive/2017/texmf-dist/tex/latex/tools/x.tex
! Interruption.
<to be read again> 
                   \begingroup 
l.1 
    %%
? x
 
Here is how much of TeX's memory you used:
 8 strings out of 492982
 261 string characters out of 6133442
 54251 words of memory out of 5000000
 3671 multiletter control sequences out of 15000+600000
 3640 words of font info for 14 fonts, out of 8000000 for 9000
 1141 hyphenation exceptions out of 8191
 3i,0n,1p,20b,6s stack positions out of 5000i,500n,10000p,200000b,80000s
No pages of output.
PDF statistics:
 0 PDF objects out of 1000 (max. 8388607)
 0 named destinations out of 1000 (max. 500000)
 1 words of extra memory for PDF output out of 10000 (max. 10000000)