Question: How do we use on the axes Pi, Pi/2 in Maple 13 plots without evaluating Pi?

How do we use on the axes Pi, Pi/2, ...,  in Maple 13 plots without evaluating Pi? When I just put enter Pi, Maple gives me 3.1415... . "piticks" is not available for Maple 13. I do have access to the university ocmputer's Maple 18, but, recently, it has decided that Citrix iwill not serve Windows 7.

Thank you.

mapleatha

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