Oops. I noticed a small typo in one of the lines in my last post where I accidentally wrote an asterisk for an underscore. About 46% of the way through my verbiage starting below the quote from JD I accidentally wrote the line:
<< it is given by FWHM = Δf = f*0*sqrt(1 + 4*Q^2)/Q. >>.
But what I ought to have written was:
<< it is given by FWHM = Δf = f_0*sqrt(1 + 4*Q^2)/Q. >> .
I certainly did *not* mean to imply the FWHM Δf had a factor of zero. The zero is a subscript on the resonant frequency.