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If you are using the open-source Librealsense SDK, this script can show all four streams simultaneously.
If you are using the RealSense SDK: I knew I had seen a script for the official SDK in the past, and managed to track it down for you. It combines color and depth into a single image.
You can make calls to specific facial landmark points in the official RealSense SDK with the QueryPoint instruction.
If you are using Linux, here is info on points for the RealSense SDK For Linux.
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