Fig. 3.

Regression tests of Outflow and WPA improvement in four different conditions of distances between the SO channel and outflow source ($D_{C{H}_{\mathit{source}},C{H}_{SO}}=0, 1, 2, 3)$. In each, we show the P value, the linear coefficient is reported as r, and the significant linear relationships are marked with asterisks (with P values adjusted to Bonferroni correction).