Preview can't find fonts used in eps file generated by gnuplot

I am trying to use TimesNewRoman.ttf as the font for *.eps files generated by Gnuplot. I am running OS X 10.9.5 on a 2010 Macbook Pro. Here is my gnuplot script. set terminal postscript eps enhanced size 5,5 font 'TimesNewRoman.ttf,20' set output "./test.eps" plot sin(x) When I open this file with Preview, I get the error: > PostScript Conversion Warning > > Converting the PostScript file “test.eps” produced the following warnings: · TimesNewRoman.ttf not found, using Courier. TimesNewRoman.ttf is an exact copy of Times New Roman.ttf. Gnuplot has problems trying to find files with spaces in the file name. So I copied the /Library/Fonts/Times New Roman.ttf to /Library/Fonts/TimesNewRoman.ttf and ~/Library/Fonts/TimesNewRoman.ttf. I believe this trick worked when I was using OS X 10.6.8, but it appears not to work in Mavericks. How can I fix this?