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Add the namelist replacements to be parsed when generating a namelist file if and when the step gets set up.
options (dict) – A dictionary of options and value to replace namelist options with new values
out_name (str, optional) – The name of the namelist file to write out, namelist.<core> by default
namelist.<core>
mode ({'init', 'forward'}, optional) – The mode that the model will run in