threats vs defects
defects
  500000 ++-----+-----+------+------+------+A----+------+------+-----+-----++
         +      +     +      +     A+      +     +  "data/td.sorted" + A    +
  450000 ++                                                                ++
         |                                                                  |
  400000 ++                                                                ++
  350000 ++                                                                ++
         |                                                                  |
  300000 ++                                                                ++
         |        A  A      A       A                                       |
  250000 ++                                                                ++
         |             A                              A                     |
  200000 ++ AA    A     A                                A                 ++
         |A A A   AA A     A   AA           A                               |
  150000 ++ A     AA A      A              A                               ++
  100000 ++ AA A    AA AA AA A  A   AA A A    A  A       A                 ++
         A  AAAA AAAAAAAA AA AA  AA  A  A  A  A    A A                      |
   50000 +AAAAAAAAAAAAAAAAAAAAAAAAAAA   AAAAAAA       A    A               ++
         AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA+ A   AA  A  A      +     +A     +
       0 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA-A-AAA--A+-AAA--+------+--A--+-----++
         0      5     10     15     20     25    30     35     40    45     50
                                       threats