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I need help with the gaussian function in 3D. I'm using the form:

z=A*exp( (x-xo)^2/(2σx^2)+(y-yo)^2/(2σy^2))

I know that A is the amplitude and xo,yo are the center coordinate.

I found that formula on http://en.wikipedia.org/wiki/Gaussian_function and they say that σx and σy are the spread of the blob. But if I put σx=σy=1, the function is from -3 to 3... Why is that ?

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# Help with the 3D gaussian function

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