Approximating Radiative Corrections for Analytical Applications in the Data Analysis

Exact calculations of the radiative corrections to the single spin asymmetry in the exclusive pion electroproduction below $\Delta(1232)$ resonance are performed by employing the EXCLURAD code. The analysis of the dependence of the obtained results on $W$, $\theta_{\rm cm}$ and $\phi$ shows that absolute values of radiative corrections do not exceed 1.5 %. The procedure of sampling the radiative corrections with analytical functions has been developed allowing for flexible and rapid applications of the corrections in the data analysis.