I just notice that ligatures are not working on my system. For example:

data-flow missing ligature.

The "flow" word does not use the f-l ligature, appearing ugly.

enter image description here

This also happens with the default article font (if I removed the renewcommand):

enter image description here

I am setting with pdflatex.

Do I have to include a particular package?

  • 1
    There are ligatures. Compare with f\/low, or try the fi ligature. – Ulrike Fischer Jun 1 '15 at 12:22
  • 1
    Try f\/low to explicitely prevent a ligature. – Johannes_B Jun 1 '15 at 12:22
  • Ok, I see the difference. So the problem then is just that in these fonts, the f-l ligature is extremely ugly? For me it looks just as if the kerning is smaller and the two characters are moved together to overlap. The f-i ligature looks correct, though. – Emit Taste Jun 1 '15 at 12:24

sorry to say, this is the fl ligature.

here is the output of running tex testfont on ptmr7t (the roman instance of the ptm fonts):

font table of font ptmr7t

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