The chemist compared the spectra of the samples to identify impurities.

Scientists compared the electromagnetic spectra of distant galaxies to identify their chemical compositions.

The researchers compared the light spectra from different stars to identify chemical signatures.

The laboratory compared the absorption spectra of several samples to determine their composition.

The researchers compared the optical spectra from the two different samples to identify subtle compositional differences.

Political scientists often map the political spectra of emerging movements to understand their ideological positions.

The researchers compared the band spectra from different samples to identify electronic transitions.

The researcher compared the mass spectra of the two samples to identify trace contaminants.

Astronomers compared the line spectra of distant stars to identify their elemental composition.

The researcher compared the first-order spectra from different samples to identify subtle compositional differences.