Here are the updated version of the talk for George Igo at the Diffraction2012 Conference, Canary Islands, Spain, Sept 10-15 2012.

I have made most of the suggested changes, except for suggestions 1/2

3) changed DeltaD(z) -> DeltaD(z,jT)

4) Removed slide 7; implications of chirality conservation are discussed previously

5) Changed comment on slide from "clear evidence" to 'hint"

6) Comment of clear evidence made

7) Replaced graphs on Slide 17 with higher resolution versions