If I forget to calibrate or the data is offset in the Tobii Pro VR Integration, can I do a calibration afterwards?

VR Integration Tobii Pro
a.    No, calibration should always be done before recording a session.
b.    You can redo a calibration whenever you notice an offset. It’s recommended to verify accuracy before starting a recording. Ask the participant to look for example at a button on the Vive controller held in front of them.