Strange extra line when plotting

[Nighteye]

Hi there

I loaded data from a txt file to octave and plotted it with loglog.
Everything works fine otherwise but from the last point it draws a line back
to point (0, 10^6). Same happens with the normal plot-funktion. I checked
the data and that point does not exist there. Not in the start, neither in
the end. I dont understand what goes wrong...

Thanks for your help in advance!
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