Hi, I was just wondering, is there any way to estimate the vollume of a MOT (formed by 3 incoming and 3 counterpropating beams at a point where the magnetic field B=0) just by seeing its 2D projection (maybe through a camera) ? I could only measure its 2 dimensions in the picture: h=0.9 mm d=0.6 mm However is there anyway to determine the 3D dimensional overlapping of the 3 propagating laser beams? Naturally if everything is perfect I think I can have a sphere... now obviously the image is not a sphere but an ellipse... I thought I could try to say that the extra dimension x=0.6 (oblate spheroid) to 0.9 (prolate spheroid) mm, but I think this doesn't make sense... It can as well be anything from 0.1 mm (even smaller) to 2*Radius[laser] ... right?