0-t_0}{\tau0} )  </math>
<br><br>
 If <math> | t - t_0 | > \tau_0 </math>, then <math> f(t) = 0 </math>.
<br><br>
    (4) <tt>tdf_trapezoidal</tt>
<br><br>
 <tt>%TDFunctions
 <br>&nbsp;&nbsp; "function-name" | tdf_trapezoidal | amplitude | tau0 | t0 | tau1
 <br>%</tt>
<br><br>
 The function ramps linearly during <math>tau_1</math> time units, stays constant for
 <math>tau_0</math> time units, and the decays to zero linearly again for <math>tau_1</math>
 time units.
<br><br>
    (5) <tt>tdf_from_file</tt>
<b