hello Werner and Deri, > An alternative to that which compresses even better might be the > `pdfsizeopt` script. > > https://github.com/pts/pdfsizeopt
actually the ps2pdf think works as a charm. the final makefile is math.pdf : math.me tbl $< |eqn -Tpdf| groff -Tpdf -k -P-e > math ps2pdf math as result, i get 4,0K math.me 176K math 8,0K math.pdf for the moment, 8ko is enough for me to defer dealing with a poorly packaged python script so i add pdfsizeopt to the todo list. thank you for your help. regards marc