Atoms can now be selected based on their element or number in
their atom set. This is very handy if you want to exclude hydrogens,
see example on page, e.g. the following script will get rid of all hydrogen atoms
found in a pdb-file:
aset_read(ifile="test.pdb");
aset_sele(sele = (element <> "H"));
aset_write(ofile="test_without_hydrogens.pdb");