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db.collection.aggregate([{"$project":{"Time":{"$avg":"$Time"},"yaw":{"$avg":"$yaw"},"pitch":{"$avg":"$pitch"},"roll":{"$avg":"$roll"},"ax":{"$avg":"$ax"},"ay":{"$avg":"$ay"},"az":{"$avg":"$az"},"gx":{"$avg":"$gx"},"gy":{"$avg":"$gy"},"gz":{"$avg":"$gz"},"mx":{"$avg":"$mx"},"my":{"$avg":"$my"},"mz":{"$avg":"$mz"}}}])