The Ocean Color Instrument (OCI) team pose with OCI and its integrated Earth Shade behind a clean tent curtain. This composite image made of two frames shows the Ocean Color Instrument team standing in front of the flight hardware before the instrument is integrated to the Plankton, Aerosol, Cloud, ocean Ecosystem spacecraft in summer, 2022. 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.