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.

Magnitude calculation e.g. cuts the amplitude information, or can be used to obtain pure absorption Lorentzian lineshapes in spectroscopy.

Usual shape of the lines in a NMR spectrum, characterized by a central peak with long tails; proportional to 1/[(1/T2)2 + (f - fo)2], where f is frequency and fo is the frequency of the peak (i.e., central resonance frequency). A Lorentzian function is the Fourier transformation of a decaying exponential.