If you are using [Tools > Options] then make sure you press the [>>] button to include the options in your model. The code should then look something like:
Alternatively, you can use [Tools > Curves] and select SHCal20. Again you must press [>>] to insert the curve into the model. This should give you something like:
and the last specified curve is used for each calibration - so you can use different ones for different samples.
If you are just calibrating a single sample from the home page of OxCal (or using the @ menu item from the viewer) you can just set the curve under [Options > Curve], return to the [@] menu and enter the date to calibrate.
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