Question: Plotting Error

I am trying to plot the function: exp(-pi*((y-3)/(1/3))^2). what I input is plot(%(the preceding function), y = -10..10); , but all I get is the error messages, (Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct) (Error, empty plot) can someone please help ? thanks, Dan
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