Difference between GetPupilPosition and pupil_position_in_sensor_area?

[Hyunseok]

Hi, I want to use position data of the center of pupil and I found that there're two options to get pupil position from SRanipal SDK.

However, each function returns different values; the value from GetPupilPosition function ranges -1 to 1, and from pupil_position_in_sensor_area ranges to 0 to 1.

Is there any difference between two functions? or just because of the criterion for normalization?

Thanks in advance.