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Font Tables
There are many fonts available (click on any row to see expanded character set for that font):

You can change the font of a text string by using one of the appropriate resources: txFont, tiMainFont, tiXAxisFont, tiXAxisFont, lbLabelFont, tmXBLabelFont, tmYLLabelFont, etc. The font can be entered as an integer index value or a string (use above table as a guide).
If there's a particular font you want to apply to all fonts in every plot you ever create, you can set the global "*Font" resource in your .hluresfile:
*Font : times-roman
Application Examples
Code Snippets
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res = True
res@txString = "Hello, World"
res@txFont = "helvetica"
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gsn_text_ndc(wks,"~F22~Hello World",0.5,0.5,txres)
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setvalues text_object
"txString" " : "Hello, World"
"txFont" : "helvetica"
end setvalues
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