<dd>Only use topology A.</dd>
<dt><b>yes</b></dt>
<dd>Interpolate between topology A (lambda=0) to topology B (lambda=1)
-and write the derivative of the Hamiltonian with respect to lambda (as specified with <b>dhdl_derivatives</b>), or the Hamiltonian differences with respec to other lambda values (as specified with <b>foreign_lambda</b>) to
+and write the derivative of the Hamiltonian with respect to lambda (as specified with <b>dhdl_derivatives</b>), or the Hamiltonian differences with respect to other lambda values (as specified with <b>foreign_lambda</b>) to
the energy file and/or to <tt>dhdl.xvg</tt>, where they can be processed by, for example <tt>g_bar</tt>.
The potentials, bond-lengths and angles are interpolated linearly as
described in the manual. When <b>sc_alpha</b> is larger than zero, soft-core