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We describe experiments that probe the evolution of shear jammed states, occurring for packing fractions ϕ_S ≤ϕ≤ϕ_J, for frictional granular disks, where above ϕ_J there are no stress-free static states. We use a novel shear apparatus that avoids the formation of inhomogeneities known as shear bands. This fixed ϕ system exhibits coupling between the shear strain, γ, and the pressure, P, which we characterize by the 'Reynolds pressure', and a 'Reynolds coefficient', R(ϕ) = (∂ ^2 P/∂γ ^2)/2. Rdoi:10.1103/physrevlett.110.018302 pmid:23383846 fatcat:nfbeqg2gnvcina4zyzxovp32fi