Points to check and fix (?) in 2022_Gretzinger_AngloSaxons

[stschiff]

When we added the 2022_Gretzinger_AngloSaxons package, we made a few decisions that need be checked by the first author:

• Our supplement gives contamination estimates without error bars. Poseidon requires them, if the estimates themselves are set. I now set them all to a dummy value of 0.001, but it would of course be good if you could actually fill the correct ones if you still have them.
• The dates in GRO004, GRO006, GRO015, GRO016, GRO020 were given only as upper bound in our Supplement. I have now set their lower bound to 900 in all of these. Please check whether that is appropriate
• All HIDXXX samples were only given with a date fixed at 400 CE. I have now set this 300-500. Please check whether that is appropriate.

Finally, I noticed that the Supplementary Tables of the paper give the same C14 date ID for samples I0790 (LintonSk352) and I0791 (Linton351), namely SUERC-20250. They are from the same grave, so the common ID indicates that only one measurement was made, which is fine, but we need the uncalibrated date. I have, for now, switched the Date_Type to "contextual", as the validator doesn't allow the type to be C14 without uncalibrated dates given.

[nevrome]

@JoschaGretzinger