Thank you everybody for your answers. It solved some of my problems,
at least about the "false" ligatures. Using the mapping=tex-text does it.
Concerning the fi (= fi) and fl (= fl) ligatures, though they exist in the
font Garamond (a True Type font), I cannot get them otherwise than
typing them directly… I suspect that the ff, ffi, ffl, st and ct ligatures do
not
exist in this Garamond.
Greetings,
Jean-Claude Raoult
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