Parse and return the radiocarbon calibration curve stored in data.
load_calib_curve(calib_curve)
| calib_curve | Name of calibration curve. One of: "intcal20", "marine20", "shcal20", "intcal13", "marine13", or "shcal13" |
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The calibration dataframe, with columns year_BP, uncal_year_BP, and uncal_year_BP_error