Chapter 7: FGS AstrometryData Processing 7.1 Data Processing Overview 7.2 Exposure-Level Processing 7.2.1 Initial Pipeline Processing 7.2.2 Observing Mode Dependent Processing 7.3 Visit-Level Processing 7.3.1 Position Mode 7.3.2 Transfer Mode 7.4 Epoch-Level Processing 7.4.1 Parallax, Proper Motion, and Reflex Motion 7.4.2 Binary Stars and Orbital Elements