Convert Smoothed gaze coordinates to raw gaze coordinates

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How can I convert smoothed gaze coordinates (in range [0,1]) to raw gaze coordinates (pixel coordinates) mathematically (I am using Eyetribe eye tracker)? I have tried multiplying smoothed gaze coordinates with the screen resolution but that doesn't work as all points are clustered at one place. I want raw coordinates to get a heatmap of gaze locations on the screen for a game.I had built the game in unity3d.

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