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## string encoding

Gnuplot's built-in string manipulation functions are sensitive to utf-8 encoding (see set encoding). For example

     set encoding utf8
     utf8string = "αβγ"
     strlen(utf8string) returns 3 (number of characters, not number of bytes)
     utf8string[2:2] evaluates to "β"
     strstrt(utf8string,"β") evaluates to 2