Question: Change thickness of Axes and tickmarks on a simple plot

I am creating 2-d plots and exporting them in .eps format using Maple 10.  I've figure out how to change the thickness of the lines in the plot, but the the axes and tickmarks are still too thin.  I tried

plot(x^2, x=-1..1, axis=[thickness=2]);

however this does not seem to work, although a similar expression does change the thickness of the grid lines:

plot(x^2, x=-1..1, axis=[gridlines=[thickness=2]]);


There has to be a simple solution to this, and any suggestions are appreciated, Thanks in advance

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