 This information is used to estimate the levels of residual inert gas build-up in the diver's tissues during and after completing a dive or series of dives.Residual gas is often expressed as "repetitive group", which is an important input value for planning the decompression for the next dive when using tables.A more detailed and extensive set of residual gas data is stored in the memory of a dive computer, and automatically applied as initial conditions to subsequent dives.