title: R pch plotting in illustator as "q"
body: <p>Every time I use pch=21 for plotting in R with lattice, my plot plots normally in the R plotting window and in pdf (circles with borders); however when I open a saved pdf version of my plot in Adobe Illustrator or Inkscape, the dots are oddly converted to "q"'s. Can anyone explain this? It's pretty frustrating, as I would like to edit my plot in either Illustrator or Inkscape.</p>
  
  <p><img src="https://i.stack.imgur.com/FseGP.png" alt="enter image description here"></p>