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Grant [Tobii]

Hi @simonsmith, the pupil size and separate eye gaze streams are advanced metrics which are only available with the Tobii Pro SDK

In order to use the Tobii Pro SDK with the 4C Tracker you must purchase a Research development license.

To obtain a quote, please get in touch with the licencing team @ https://developer.tobii.com/license-agreement/contact/

Best Wishes.