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##### System-wide header arguments

System-wide values of header arguments can be specified by customizing the `org-babel-default-header-args` variable:

         :session    => "none"
         :results    => "replace"
         :exports    => "code"
         :cache      => "no"
         :noweb      => "no"

For example, the following example could be used to set the default value of `:noweb` header arguments to `yes`. This would have the effect of expanding `:noweb` references by default when evaluating source code blocks.

         (setq org-babel-default-header-args
         (cons '(:noweb . "yes")
         (assq-delete-all :noweb org-babel-default-header-args)))