>TDLasers</tt>,
 <tt>octopus</tt> outputs the laser field to the file <tt>td.general/laser</tt>.
</li>
<li><b>velocity</b>:  When set, outputs the velocity, calculated from Ehrenfest theorem,
 in the file <tt>td.general/velocity</tt>. This file can then be
 processed by the utility <tt>hs-from-vel</tt> in order to obtain the harmonic spectrum.
</li>
<li><b>populations</b>:  Outputs the projection of the time-dependent Kohn-Sham Slater determinant
 onto the ground-state (or approximations to the excited stat