On May 3, 2014, at 5:21 PM, Konstantin Pavlovskii wrote: > Alternatively, if you find it more appropriate you can write > > Pextra = (6.0 * pi * clight * cgrav * tau)**(-1.0) * lsol / msol * kap * (L/Lsun) / (M/Msun) > > Kind regards. Kostya. That's great --- thanks again. -Bill