Approximates spectral lines using gaussian error distribution curves.
This makes it possible to get the rgb values of a certain wave length.

The sourcecode also shows how to use the AmigaOS function ObtainBestPen().

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 2408    4700  51.2% -lh5- 92ae Jul 19  2004 Intui_Spectrum_1.02/Intui_Spectrum
[generic]                 1929    6158  31.3% -lh5- 66d8 Jul 19  2004 Intui_Spectrum_1.02/Intui_Spectrum.c
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         2 files    4337   10858  39.9%            Jul 29  2004