We measure the anisotropic clustering of the quasar sample from Data Release 16 ( DR16 ) of the Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Survey ( eBOSS ) .
A sample of 343 , 708 spectroscopically confirmed quasars between redshift 0.8 < z < 2.2 are used as tracers of the underlying dark matter field .
In this paper , we present the analysis in configuration space by measuring the two-point correlation function and decomposing it using the Legendre polynomials .
For the full-shape analysis of the Legendre multipole moments , we measure the BAO distance and the growth rate of the cosmic structure .
At an effective redshift of z _ { eff } = 1.48 , we measure the comoving angular diameter distance D _ { M } ( z _ { eff } ) / r _ { drag } = 30.66 \pm 0.88 , the Hubble distance D _ { H } ( z _ { eff } ) / r _ { drag } = 13.11 \pm 0.52 , and the growth rate f \sigma _ { 8 } ( z _ { eff } ) = 0.439 \pm 0.048 .
The accuracy of these measurements is confirmed using an extensive set of mock simulations developed for the quasar sample .
We also perform a BAO-only analysis to cross check the robustness of the methodology of the full-shape analysis .
Combining our analysis with the Fourier space analysis , we arrive at D ^ { \bf { c } } _ { M } ( z _ { eff } ) / r _ { drag } = 30.21 \pm 0.79 , D ^ { \bf { c } } _ { H } ( z _ { eff } ) / r _ { drag } = 13.23 \pm 0.47 , and f \sigma _ { 8 } ^ { \bf { c } } ( z _ { eff } ) = 0.462 \pm 0.045 .