in that vs so that

in that

conj
  • In the fact that; in the sense that; for the cause or reason that; because. 

so that

conj
  • Indicates purpose; in order that, with the result that. 

  • Indicates purpose; in such a way that, with the intent that. 

How often have the words in that and so that occurred in a corpus of books? (source: Google Ngram Viewer )