Extracted core source size $r_\text{core}$ for primordial $\ppiMinus$ pairs for several \mtText{} ranges. The obtained result is compared with the results from p--p pairs , $\uppi^\pm$--$\uppi^\pm$ and $\text{p--}\text{K}^+$ pairs . The statistical (systematic) uncertainties are shown as lines (boxes). The extrapolated scaling of p--p pairs  is shown as the gray band.