A line shape characterized by a bell-shaped form; proportional to exp (-(f - f0)2/Df2) where Df is a measure of the line width.

A mathematical function used for signal fitting (filtering) of raw data. Other commonly used line shapes are the Gaussian line shape or the super-Lorentzian line shape.

Distribution of the relative strength of resonance as a function of frequency, which establishes a particular spectral line. Common line shapes are Lorentzian and Gaussian.