n, calculated from Ehrenfest theorem,
 in the file <tt>td.general/acceleration</tt>. This file can then be
 processed by the utility <tt>hs-from-acc</tt> in order to obtain the harmonic spectrum.
</li>
<li><b>ftchd</b>:  Write Fourier transform of the electron density to the file <tt>ftchds.X</tt>,
 where X depends on the kick (e.g. with sin-shaped perturbation X=qsin).
 This is needed for calculating the dynamic structure factor.
 In the case that the kick mode is qbessel, the written quantity is integral 