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There are separate graphs for the southern hemisphere and for calibration of marine data.To produce a curve that can be used to relate calendar years to radiocarbon years, a sequence of securely dated samples is needed which can be tested to determine their radiocarbon age.
Again, the ranges within the 1σ confidence range are in dark grey, and the ranges within the 2σ confidence range are in light grey.
The INTCAL13 data includes separate curves for the northern and southern hemispheres, as they differ systematically because of the hemisphere effect; there is also a separate marine calibration curve.
Once testing has produced a sample age in radiocarbon years, with an associated error range of plus or minus one standard deviation (usually written as ±σ), the calibration curve can be used to derive a range of calendar ages for the sample.
Radiocarbon years ago may be abbreviated " The Northern hemisphere curve from INTCAL13.
As of 2017 this is the most recent version of the standard calibration curve.
Programs to perform these calculations include Ox Cal and CALIB.