Question: math symbols on labels

Hi

I have a plot using plot() function. I would like to label the x-axis using math symbol (example a_subscript 0).

Is there any way I could do this. I tried label=["a[0]", "some text"]. However, the label on x-axis appears as a[0].

 

I am using Maple 15 Worksheet.

Thanks in advance.

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