This slide discusses the API that was previously shown in the block diagram. Users may want to familiarize themselves with quaternions. There are some good videos available to provide a good sense of what is involved with the complex numbers. Another output is the heading, pitch, and roll. Sometimes the terms will be shown as yaw, pitch, and roll; the yaw is also known as heading. Linear acceleration is provided with the gravity, the 1g offset, removed. There are many applications available for an iPhone or a smartphone, Android-based, or other, that can be downloaded to read the linear acceleration, going through filtering to remove gravity. These functions are what are output by Sensor Fusion. A header file will be generated and the user can call functions requesting quaternions, heading, and linear acceleration; the API will provide the requested data.