ersatz vs off the mark

ersatz

noun
  • Something made in imitation; an effigy or substitute. 

adj
  • Made in imitation; artificial, especially of a poor quality. 

off the mark

prep
  • Making a start (generally in comparison to others). 

  • Inaccurate; not correct or appropriate. 

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