id	keyword
ap-1903	sze
ap-1903	cluster
ap-1903	thermal
ap-1903	galaxy
ap-1903	plasma
ap-1903	planck
ap-1903	observations
ap-1903	spectrum
ap-1903	cmb
ap-1903	frequency
ap-1903	colafrancesco
ap-1903	electron
ap-1903	distribution
ap-1903	emission
ap-1903	polarization