holograph vs text file

holograph

noun
  • A handwritten document that is solely the work of the person whose signature it bears, especially a letter, deed, or will; an original manuscript, a protograph. 

  • A hologram. 

verb
  • To record by means of holography. 

text file

noun
  • A data file containing only plain, human-readable text, distinct from documents with embedded formatting 

  • A data file in a character encoding that allows it to be read in non-specialised text editor. 

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