There is no specific meaning or context provided in the question. Therefore, it is difficult to determine what "coarsening of the fac" refers to. Please provide more information or clarify your question.
I'm sorry, but your question seems to be incomplete. Could you please provide more information or clarify what you are asking about?
I'm sorry, but can you please provide more context or clarify your question? What do you mean by "coarsening of the fac"?
