R J ⁡ ( 0 , y , z , ± y ⁢ z ) = ± 3 2 ⁢ y ⁢ z ⁢ R F ⁡ ( 0 , y , z ) R_{J}\left(0,y,z,\pm {\sqrt {yz}}\right)=\pm {\frac {3}{2{\sqrt {yz}}}}R_{F}\left(0,y,z\right)