prt(t, printflag = TRUE, relabel_nodes = FALSE, time_bp_digits = 7, add_root_edge = TRUE, get_tipnames = FALSE, fossils_older_than = 0.6)phylo tree object.TRUE.FALSE.fossils_older_than will be marked as TRUE
  in a column called fossil. This is not currently
  set to 0, because Newick files can have slight precision
  issues etc. that mean not all tips quite come to zero.
  You can attempt to fix this with
  average_tr_tips (but make sure you do not
  inappropriately average in fossils!!).dtf A data.frame holding the
  table. (Similar to the printout of a
  phylo4 object.)
Matzke_2012_IBS
phylo, average_tr_tips