Open Access
Fig. 3.
Diagrams for some of the trispectrum terms involved in the covariance of the galaxy angular power spectrum 
. From left to right: 4-halo, 3-halo, and 2-halo 1+3 term. Galaxies 1 and 2 are the source of the first power spectrum 
, while galaxies 3 and 4 are the source of the second power spectrum 
.
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