Transport coefficients. (a) Quiescent elastic shear modulus as a function of the ratio and (inset), where ϕ_r is the packing fraction reduced by the random close packing fraction ϕ_RCP. (b) Shear viscosity and the product of elastic modulus and relaxation time as functions of reduced packing fraction. Data for 3D colloids are shown (line+symbol) for comparison. The viscosity under four different stresses is also shown. The inset shows the viscosity and the product in 3D in a wider range of (normal) packing fraction.