Then the strong spectrum composition is removed from the spectrum signal with the threshold method to eliminate the interference with the continuous spectrum fitting.

Different elements or compounds absorb and emit different colors or wavelengths of light, and by studying a star's spectrum, one can divine what its composition might be.

By using the technology of IR spectrum, the result showed that the basic structure of melanin of Black Bone Sheep is similar to silky fowl, and the mainly composition is eumelanin.