Summary of different models and date ranges for the Last Voyage (LV) Boundary.

The table shows the 68.3% and 95.4% hpd calendar date BCE (Cal BCE) ranges for the TPQ Boundary (Models 1A to 1C only) and LV Boundary from each of Models 1A-1C and 2A-2C, and the Difference query for the time period between the TPQ and the LV for Models 1A to 1C, along with OxCal Amodel (Am) and Aoverall (Ao) values across the 6 models, and comparing the values achieved with the new AMSAdjustedIntCal20 14C dataset (with curve resolution set at 5 years) versus those from IntCal20 (with curve resolution set a 1 year) in grey shading. The Am/Ao values for Model 1B are unsatisfactory (14C data and the 14C calibration curve. For Model 1C, as an example, we also list the results if the AMSAdjustedIntCal20 14C dataset is used but with 1 year curve resolution (bold text). While the 1-year resolution model results overall are noisier (see S8 Fig), the findings for the TPQ and LV Boundaries are very similar to the 5-year resolution models. For Model 1C we list also the results employing the GrM and European oak adjusted overall dataset (see Fig 4B), ‘AMSAdjustedIntCal20_GrMbased’, in underlined text (see S9 Fig). Finally, for Model 1C, we list the results if the two apparently (subjectively) somewhat older 14C ages, for OxA-30953 and OxA-31033 (both have individual OxCal Agreement values Fig 9), are excluded from the analysis (italicized text). This makes little difference. Since neither date is an outlier within the model (outlier probabilities respectively 4% and 3%, both Fig 9) we leave them in.