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How can I create a comma-separated list of characters from a text string?

Since you're already using PGF/TikZ you might as well use the parser module that comes with it. We'll define a parser char parser that does something (/char parser/do) with each letter, for this we ...
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Command for comma in math or text mode

I would use "$T_{1,2}$" as that will be easily understood by any software or human reading the csv file. However comma is ASCII decimal 44, hex 2C so you can use ^^2c if you wish: \...

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