Question: Can't plot this astroid properly in Maple

How do I get the entire astroid given by the equation x^2/3+y^2/3=1 to show?

I've used implicitplot(x^2/3+y^2/3=1,x=-1..1,y=-1..1), and only 1/4 of the astroid is shown.

thanks for your help.

 

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