Figure 5. Time-volume plots for Cores (A) 164-997A-18P, (B) 164-997A-49P, and (C) 164-997B-15P. Core 164-997A-18P did not contain CH4 hydrate at in situ conditions nor at the start of gas-release experiments (Table 1 and Table 3). Core 164-997A-49P contained CH4 hydrate at in situ conditions and at the start of gas-release experiments (Table 1 and Table 3). Core 164-997B-15P did not contain CH4 hydrate at in situ conditions nor at the start of gas release experiments (Table 1 and Table 3). However, this core would have contained CH4 hydrate in pore space at in situ pressure if the in situ temperature was at 0ºC. Note that for all cores "sawtooth profiles" are observed where pressure increases over time when the valve from the PCS to the manifold is closed.