relative spectral sensitivity of the human eye (thing)

The above data fed through gnuplot:

   1 ++------+--------+-------XXX------+-------+-------+--------+------++
     +       +        +     X +  X     +       +       +        +       +
     |                                                                  |
 0.9 ++                            X                                   ++
     |                     X                                            |
 0.8 ++                                                                ++
     |                               X                                  |
     |                                                                  |
 0.7 ++                  X                                             ++
     |                                                                  |
 0.6 ++                                X                               ++
     |                                                                  |
     |                                                                  |
 0.5 ++                X                X                              ++
     |                                                                  |
     |                                                                  |
 0.4 ++                                   X                            ++
     |                                                                  |
 0.3 ++               X                                                ++
     |                                      X                           |
     |                                                                  |
 0.2 ++             X                        X                         ++
     |            X                                                     |
 0.1 ++                                        X                       ++
     |         X X                               X                      |
     +      XX        +       +        +       +  X    +        +       +
   0 X+XX-X--+--------+-------+--------+-------+----X-XX-X-XX-X-XX-----++
    400     450      500     550      600     650     700      750     800