{{Infobox model parameter| name = {{PAGENAME}}| param = <onlyinclude>''Φ<sub>ex</sub>''<noinclude/onlyinclude> The fast | desc = Fast exchange factor, in rad2.s-2. This is equal to| equation = {{:pA}}{{: pB}}{{:Phiexdeltaomega2}} | units = pApBΔω2rad<sup>2</sup>.s<sup>-2</sup>}}