6 | | The figure gives an overview of the different routines that might need to be provided to the analysis step of an ensemble filter. The actual routines depend on the chosen filter method. The routines are organized in three groups: |

| 8 | Figure 1 gives an overview of the different routines that might need to be provided to the analysis step of an ensemble filter. The actual routines depend on the chosen filter method. The routines are organized in three groups: |

| 9 | |

| 10 | * '''Model Interface:'''[[BR]] |

| 11 | The model Interface consists of the routines `collect_state_pdaf` and `distribute_state_pdaf`. These routine perform the concersion between model fields and state vector. The routines have been discussed in the context of the [ModifyModelforEnsembleIntegration modification of the model for the ensemble integration]. |

| 12 | * '''OMI Observation Module:'''[[BR]] |