loop graphs that contribute to the deviation from linearity [@Kubis:2000aa]. The Figure shows that non-linear $q^2$ behavior is to be expected from the magnetic form factor for moderate pion masses. The EFT, however, is at a loss to describe the lattice data at the minimal lattice momentum transfer available on current dynamical lattices: $q^2 = 0.25 \, \texttt{GeV} \, {}^2$ lies far off the axis in the plot, certainly too far to utilize the EFT.

Twisted Boundary Conditions and Finite Volume Modifications {#s:finvol}
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From our discussion in Sect. \[s:extension\], we know that the restriction to discrete lattice momentum can be circumvented by using partially twisted boundary conditions and calculating matrix elements of the isospin raising operator, see Eq. . We demonstrate that this is the case by calculating the isovector magnetic form factor using partially twisted baryon . Additionally by using this theory at finite volume, we can deduce the dynamical effects due to the boundary conditions. These effects are systematic errors that must be removed to determine the form factor.

### Partially Twisted and Partially Quenched 

In the meson sector of partially quenched  () [@Bernard:1994sv; @Sharpe:1997by; @Golterman:1998st; @Sharpe:2000bc; @Sharpe:2001fh], the coset field $\Sigma$, which satisfies twisted boundary conditions, 