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$\Xi$ may not be what you want, but (a) it's the correct answer to the question as stated; (b) I can't understand why you'd complain that the font used is *more* legible than a handwritten example deliberately chosen to be difficult to parse. $$\frac{\Xi}{\overline{\Xi}}$$ isn't marvellous, but it's certainly not as bad as the image in the question.