title: in Excel, how to find FWHM of data?
body: <p>In Excel, I have two columns X and Y, and Y is Gaussian type of peak, how can I find the Full-width half maximum (FWHM)?</p>
  
  <p>I want to find all Y cells that are greater than half maximum and find the first and last corresponding X values, how can I do that? Is there a better way?</p>