Experimental data reported in [42] describing the anisotropic response of the passive
myocardium. The strain-stress data are obtained in biaxial stretch tests for
different stretch ratios in the fiber and cross fiber directions, i.e, 1:1, 2:1,
and 1:2, respectively. The strain-stress data are shown in the fiber (left) and
cross fiber (right) direction using the deformation gradient tensor
F and the first Piola Kirchhoff tensor P.