Convert UORB 'vehicle_attitude' quarternion to Euler angles

Hi, Hopefully this is a simple question.

I am reading the quarternion values off vehicle_attitude UORB topic and i want to convert these values to Roll Pitch and Yaw angles to feed into a controller as the vehicle states.
Basically I dont understand what units they are in.

After the conversion are the values in degrees or radians ?

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