How to remove the commas from the axis's values?

Hi. I have plotted this graph in the PNG format, but the values at the axis are shown with a comma at the end. How to suppress the comma?

Moreover, I can get only output in PNG format:
The PDF output does not work using:

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_ROOT Version:6.26.06
_Platform:Linux Mint 20
_Compiler:GCC 9.4.0

I have no idea how such a comma can show. I never saw that. Can you provide an example reproducing this?

Actually I solved the issue by changing the the current locale’s decimal separator from Spanish (comma) to US (dot). I can get even the PDF output file now.

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