Plot ascii file with markers and only show limited number of markers

Hi guys,
I need to plot a “large” ascii csv file. Every columns is more than 5000 points, I need to plot multiple columns and I want to plot them black and white with markers. Unfortunately, the default behaviour is to plot a marker for every point and we don’t see them. How can I proceed to only show a limited number of markers ?

thank you for your help.

ROOT Version (e.g. 6.12/06):
Platform, compiler (e.g. fedora 27, gcc7.3.1):

It depends how you plot these markers. Can you show an example ?

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