simple matlab script that calculates and plot the FWHM of the intensity of a line profile. Image processing must be performed beforehand, typically background subtraction, image stabilization/registration, and possibly averaging, smoothing, or spatially filtering. FWHM function was based on the following function available on the MathWorks File Exchange at the following URL: https://www.mathworks.com/matlabcentral/fileexchange/10590-fwhm