18 | | * SEIK (Pham et al. (1998a, 2001), the implemented variant is ~~more detailed described~~ by Nerger et al. (2005)) |

19 | | * ETKF (The implementation follows Hunt et al. (2007) but without localization) |

20 | | * SEEK (The original formulation by Pham et al. (1998) |

21 | | * EnKF (The classical formulation with perturbed observations by Evensen (1994) |

| 18 | * SEIK (Pham et al. (1998a, 2001), the implemented variant is described in more detail by Nerger et al. (2005)) |

| 19 | * ETKF (The implementation follows Hunt et al. (2007) but without localization which is in the LETKF implementation) |

| 20 | * SEEK (The original formulation by Pham et al. (1998)) |

| 21 | * EnKF (The classical formulation with perturbed observations by Evensen (1994)) |