Figure 2. Density of CO2 (in g/cm3) as a function of pressure and temperature, shown in pressure−temperature space (A) and in depth-fraction of lithostatic pressure space (B). Hydrostatic and lithostatic pressure gradients shown in (A) assume a geothermal gradient of 25 °C/km. The shaded area represents the PT conditions technologically and economically accessible for CO2 storage in saline formations. Notice that A and B contain the same data presented on different axes.