ectype vs tracing

ectype

noun
  • A copy, reproduction; especially as contrasted with the original, archetype, or prototype. 

  • An object in relievo or embossed. 

  • An idea or impression that corresponds to external reality. 

  • An impression (in wax, clay, &c.) of a seal or medal. 

tracing

noun
  • The reproduction of an image made by copying it through translucent paper. 

  • A record in the form of a graph made by a device such as a seismograph. 

  • The process of finding something that is lost by studying evidence. 

  • A regular path or track; a course. 

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