Clogged tics in high-res pngcairo terminal

Hello, dear list.

I am plotting a two-column, 1000-element-each CSV file using the script
attached.

I am using pngcairo with enhanced font times 40 and a resolution of
4096x2160.

The resulting .png has the correct plots but the numbers of the values of
the tics are overlapped. See this image:
https://www.dropbox.com/s/w1a9ch0emh3l1zl/singleplot.png?dl=0.

If using the eps terminal, there is no problem with the tics, although I
don't seem to be able to use 'times', and I happened to have a hard time
loading eps files in the latex template of my uni so I'd prefer to stick to
.png files.

I have generated several .png files in the past using the same pngcairo
terminal as in the script and it was fine.

If I had accidentally set something wrong, shouldn't the 'reset' at the end
get rid of that?

Thank you so much for your help.

Dario

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