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<a name='Time-Dependent'</a>
<H2>Time-Dependent</H2>


<p><b><a name='TDExternalFields'></a>TDExternalFields</b>
<br/><i>Section</i>: Time-Dependent
<br/><i>Type</i>: block
<br/><br> The block <tt>TDExternalFields</tt> describes the type and shape of time-dependent
 external perturbations that are applied to the system.
<br><