Reference value 2012-01-19
Average z-displacement: -0.005208646473438716 (standard formulation)
Average z-displacement: -0.005208646473438715 (first variation of total energy)

Reference value 2015-06-29 (FEniCS 1.5)
Average z-displacement: -0.005208646473438716 (standard formulation)
Average z-displacement: -0.005208646473438716 (first variation of total energy)