Gnuplot combine symbols

by Βασιλης Ιωσηφιδης   Last Updated May 11, 2018 22:23 PM

I am trying to use symbols and combine them inside a figure in order to create different combination but I have not found any example. I want something like this:

enter image description here

Combined symbols do not exist so there must be another way to make different combinations with these.

I found this figure from paper:

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