% SI2FWHM Converts standard deviation to FWHM
%
% The full width at half maximum (FWHM) of a normal distribution is
% calculated, based on its standard deviation.
%
% FORMAT w = si2fwhm(si)
%
% OUT w Full width at half maximum.
% IN si Standard deviation.
% 2007-11-29 Created by Patrick Eriksson.
function w = si2fwhm(si)
w = (2*sqrt(2*log(2))) * si;