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The physics of the outer layers of a star are not well understood but theselayers make a major contribution to the large separation. We quantify thisusing stellar models and show that the contribution ranges from 6\% from theouter 0.1\% of the radius to 30\% from the outer 5\%. and therefore argue thatthe large separation should not be used as a constraint on surface layerindependent model fitting. The mass and luminosity are independent of the outerlayers and can be used as constraints, the mass being determined from binarityor from surface gravity and radius. The radius can be used as a constraint butwith enhanced error estimates. We briefly consider the determination of thelarge separation for $\alpha$ Cen A and find that mass derived from surfacegravity is closer to the binary mass than that derived from the largeseparation.

On the use of the average large separation in surface layer independent model fitting