The Ocean Color Instrument (OCI) is prepared for testing in the Electro Magnetic Interference (EMI) chamber showing the radiator side of the instrument. This test will help engineers and scientists learn if OCI will be compatible with the electromagnetic environment on the spacecraft. OCI is a highly advanced optical spectrometer that will be used to measure properties of light over portions of the electromagnetic spectrum. It will enable continuous measurement of light at finer wavelength resolution than previous NASA satellite sensors, extending key system ocean color data records for climate studies. OCI is PACE's (Plankton, Aerosol, Cloud, ocean Ecosystem) primary sensor built at Goddard Space Flight Center in Greenbelt, MD.