If you had drawn the Bent Pyramid determinations as a vertical line then it wouldn't change the sense of the graph which might then be of interest to radiocarbon dating as the model from which to work from in their statistical analysis, that's why I thought Oxford might be interested in your work, not that I expected you would have a higher degree in radiocarbon dating.

The 1970 determination in the literature (referenced previously) is sufficiently clear in providing the residual level of the carbon 14 isotope, so we know what the level should be 50 years later.
I suppose that it is easy to calculate the date or perhaps more than one that a sample having that residual level of carbon 14 would now be dated based on a modern correction factor since tree rings have revealed the varying levels of carbon 14 in the atmosphere, but I'm not sure how far back the series extends.
ie the current concentration could perhaps be interpreted as a younger date when the atmospheric concentration was low or an older date when the atmospheric concentration was high.

I stand to be corrected on this because my notes from a practical radio-chemistry course are now over 40 years old and there was no training in carbon 14 dating.

You graph suggests a significant error of 200 years on the conventional date of Khufu's pyramid, so it does represent a significant challenge to the field of radio-chemistry. J. Steele, professor of Egyptology, is accomplished in the field of historical astronomy.

Mark