... Tables 1 to 5 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html .. NED . ... There is one more method to disentangle well hot star and shock wave excitation in ELGs with the help of diagnostic diagrams, where the [O I ] ? ... As mentioned already by Heckman ([ 1980 ]) as well as by BPT81 and VO87 this is probably the best method to distinguish between the three mechanisms of activity in ELGs. ...