check up on vs pan out

check up on

verb
  • To look after or inquire about someone's well-being. 

  • To examine or inspect something in order to determine its condition; to check out. 

pan out

verb
  • To proceed according to plan; to result or end up. 

  • To separate and recover (valuable minerals) by swirling dirt or crushed rock in a pan of water, in the manner of a traditional prospector seeking gold. 

How often have the words check up on and pan out occurred in a corpus of books? (source: Google Ngram Viewer )