'Command line pdftotext decimals don't work

I have a problem with pdftotext, in practice if in the specific command a decimal in the options "w" the reading of the pdf document does not work, here is the example of my command:

pdftotext -layout -y 714 -x 102 -W 14,39 -H 28 example.pdf pdf-example.txt

if, on the other hand, I delete the decimal figure from the command, everything works correctly.

I hope I have been clear enough.

Greetings



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