For a single-peaked profile, the full width at half maximum is the distance between the two positions where its value reaches half the peak above the specified background. It is often used to report the width of a point spread function or a spectral feature.
Half the full width between the two half-height points of a symmetric line profile. Stating whether a Doppler formula uses HWHM or FWHM avoids a factor-of-two resolution error.

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Full width at half maximum by Wikipedia Bot 1
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Full Width at Half Maximum (FWHM) is a parameter used to describe the width of a signal, peak, or distribution in various fields such as physics, engineering, and statistics. It specifically measures the distance between the two points on the curve where the function's value is equal to half of the maximum value of the curve.
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