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Extending an inversion
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Two cases are dealt with here: 
  - an inversion that stopped unduly e.g. because the computing time was up or a disk was full or another such issue
  - an inversion that stopped duly but must be extended e.g. the total number of simulations is reached or a better convergence can be asked for.
  

1) In case the inversion has been unduly stopped, remove the last directory generated by the CTM (for example, for CHIMERE with periods of 24 hours, the last day available).
2) Modify the yaml to use the computations which are valid:

   - in :bash:`obsoper`, option :bash:`autorestart` must be ``True``
   - in :bash:`simulator`, option :bash:`reload_from_previous` must be ``True``. If :bash:`simulator` is not specified in the yaml (because it is not necessary when the default cost is used, as is generally the case), specify it as shown in the following example.
   
.. container:: toggle

  .. code-block:: yaml
  
      mode:
        minimizer:
          df1: 0.5
          epsg: 0.1
          maxiter: 10
          nsim: 25
          plugin:
            name: M1QN3
            version: std
          simulator:
            plugin:
              name: gausscost
              version: std
            reload_from_previous: true
        plugin:
          name: 4dvar
          version: std
        save_out_netcdf: true
      obsoperator:
        plugin:
          name: standard
          version: std
          type: obsoperator
        autorestart: True

3) If the inversion is to be extended, the characteristics of the minimizer linked to the stopping criteria must be changed. For example, for m1qn3, :bash:`epsg` can be decreased and :bash:`maxiter, nsim` can be increased.
4) the job can then be launched again.

.. ##### lien avec ceci: pour relancer une inv en cours: supprimer le répertoire dans lequel le modèle s'est arreté (ex: adj_0015) et relancer avec autorestart dans obsoper et reload_results dans mode