These plots illustrate several important aspects of the material system design space in the context of an LDV. Within the range of parameters that are typically relevant and physical for complex hydrides (Table ), integrating over the scatter plots in Figure reveals that only 34% of the possible material design space can exceed the 350 bar target and only 14% of possible design space can exceed the 700 bar volumetric targets. These results confirm the difficulty of achieving a storage material that can exceed pressurized gas for on-board hydrogen storage. They also reveal other critical nonlinearities, in particular: