COPSS (Carbon Monoxide Power Spectrum Survey)
is a survey of carbon monoxide at around redshift 3,
to learn about molecular clouds and their
associated star formation during that time period.
The survey uses intensity mapping data from various sources,
including data from a Sunyaev-Zel'dovich ArrayCMB survey.
Among COPSS's aims is uncovering star formation using a means that
includes smaller, less luminous galaxies that presumably harbor
much or most of the star formation but are not identified and
analyzed individually.