effort vs defects
defects
  400000 ++--------+--------+-A-------+--------+---------+--------+--------++
         +         +        +         +        +    "data/ed.sorted"   A    +
  350000 ++                                                                ++
         |                                                                  |
  300000 ++                                                                ++
         |                                                                  |
         | A                                                                |
  250000 ++      A                                                         ++
         |                                                       A          |
  200000 ++        A                                                       ++
         |  A      A                                                        |
  150000 ++      A                                                         ++
         | AAAAA       A A      A      A   A                                |
  100000 +AAA AAAAA AA A  A       A                                        ++
         |AAAAAAA  AAAAAAA  A   A  A      A                                 |
         AAAAAAA AAAAAAA A  A     AA           A   A                        |
   50000 AAAAAAAAAAAAAAAAAAAA   A             A                            ++
         AAAAAAAAAAAAAAAAAAAA  A  A  A+  A     +         +        +         A
       0 AAAAAAAAAAAA-----A-+---------+--------+---------+--------+--------++
         0       20000    40000     60000    80000     100000   120000   140000
                                       effort