The comet's composition was determined spectrographically, revealing unexpected concentrations of organic molecules.

The research team calibrated the spectrograph before the night of observations to ensure accurate spectral data.

The observatory upgraded its spectrographs to capture fainter spectral lines from distant galaxies.

The astronomers relied on spectrographical measurements to determine the star's chemical abundances.

Careful spectrographic analysis of the meteor samples revealed unusual isotopic ratios.

The research team compared the sensitivity of two mass spectrographs to detect trace organic contaminants in seawater.

The chemist carefully calibrated the mass spectrograph before running the sample to ensure accurate isotope measurements.