line profile 

https://doi.org/10.1351/goldbook.08504
Graph of the variation of emitted radiation intensity as a function of wavelength (emission line) or the variation of the absorption factor as a function of wavelength (absorption line).
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 724 (https://doi.org/10.1515/pac-2019-0203)