function, both using the distant observer approximation. Modern redshift surveys havee survey geometries with wide opening angles. In these cases, the distant-observer approximation is inappropriate and the wide-angle effect is not negligible in order to handle the information contained in the survey. @sza98 derived a formula of velocity distortions in the linear two-point correlation function with wide-angle effect. @mat00 derived the most general formula of the linear two-point correlation function in which the velocity distortions, the AP effect, and the wide-angle effect are all included in a unified formula. All the previous formulas for the linear two-point correlation function are limiting cases of the last formula. Our construction of the correlation matrix $R$, which is explained in the following section, takes full advantage of the last expression.

 Constructing Correlation Matrices in Redshift Space \[sec3\] 
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 The General Formula of the Correlation Function in Redshift Space 
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To obtain the correlation matrix of equation (\[eq2-9\]), it is necessary to have the analytic expression of the correlation function $\xi^{\rm (s)}({{\mbox{\boldmath $s$}}},{{\mbox{\boldmath $s$}}}')$, which is given by @mat00. For completeness, we reproduce the formula in this section. Before that, we need to introduce some basic notations.

The unperturbed metric is given by the 