Dear Meepers,
I am a littel confused by the Gaussian Src in meep.
For example, 
assuming all the wavelength are normalized to 50nm,
I have a Gaussian Src fcen=600nm, ranging from 600nm-700nm,
in the code,
I write as below,
 (define-param fcen 50/650=0.077)
but now how I could define the fwidth?
Thanks
Gu
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