##  [4.3.1.2 Bi-Color](/home/4-laser-system/43-laser-wavelength/431-flexible-color-mapping-fcm/4312-bi-color) 

The Bi-Color FCM, represented pictorially in Figure 4-9, is defined by 2 unique wavelengths according to the mapping: 24 quads in the Northern hemisphere at wavelength 1, shown in red, and 24 quads in the Southern hemisphere at wavelength 2, shown in blue.

 ![Bi-Color FCM wavelength distribution](https://nifuserguide.llnl.gov/sites/nifuserguide/files/styles/large/public/2024-07/bi-color-fcm.jpg?itok=AVe121qo "Bi-Color FCM wavelength distribution")

  *Figure 4-9. Bi-Color FCM wavelength distribution.*