Half width at half maximum ( HWHM) is half of the FWHM if the function is symmetric. In other words, it is the width of a spectrum curve measured between those points on the y-axis which are half the maximum amplitude. In a distribution, full width at half maximum ( FWHM) is the difference between the two values of the independent variable at which the dependent variable is equal to half of its maximum value.
Concept in statistics and wave theory Full width at half maximum
