Two different versions of the image are being shown depending on which resolution you click on (one of them has a wrong sign so this matters).
Dimensions edit
This figure would actually benefit from normalising the dimensions to the wavelength, so that axis could be x/lambda and y/lambda. The solution would be exactly the same, and the beam would be so much more general. 137.73.4.60 (talk) 15:22, 19 July 2012 (UTC)
