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I do it with this application I have for our lab. Image attached.

I saw the Gemini in NY. It was awesome!

It was fun just watching it.

Great innovation.

Mukesh

I am more interested in the geometry of the progressive surface eg why is V1 different to V11? What does a bi polar design mean etc.

I understand that we are now in the 5th generation of PAL's. Could someone outline the various generations of design, with examples.