effort vs threats
threats
  45 ++------+-------+-------+-------+------+-------+-------+-------+------++
     +       + A     +       +       +      +       "data/et.sorted"+  A    +
  40 ++                                             A                      ++
     |    A                                                                 |
  35 ++      A                                         A                   ++
     |  A A AA    A         A     A                                         |
  30 ++  A     A  A                                                        ++
     |AAA AAA  A               A              A                             |
  25 AAAAA A AAA  AA A A  A A            A                                 ++
     |AAAAA  AAAAA  AA    AA                                            A   |
  20 ++AAAAAA AAA AAAA A                      A      A        AA           ++
     AAAAAAAAAAAAAAA AAA    A         A       A  A                          |
  15 AAAAAAAAAAAAAAAA AA  A   A    A    A                                  ++
     AAAAAAAAAAAAAAAAAAA  A A     A  A     A                                |
  10 AAAAAAAAAAA AAAAA AA A     A   A        A  A                          ++
     AAAAAAAAAAA AAA  AA  AA  AA A  A     A                                 |
   5 AAAAAAAAAAAAAA AA    AA  A  A                                         ++
     AAAAAAAAAAAAA AA+  A    +     A +      +       +       +       +       +
   0 AAAAAAAA+AA-A---+-------+-------+------+-------+-------+-------+------++
     0     10000   20000   30000   40000  50000   60000   70000   80000   90000
                                     effort