r><br>
 <tt>%TDFunctions
 <br>&nbsp;&nbsp; "function-name" | tdf_from_file | "filename"
 <br>%</tt>
<br><br>
 The temporal shape of the function is contained in a file called <tt>filename</tt>. This file
 should contain three columns: first column is time, second and third column are the
 real part and the imaginary part of the temporal function <i>f</i>(<i>t</i>).
<br><br>
    (A.6) <tt>tdf_from_expr</tt>
<br><br>
 <tt>%TDFunctions
 <br>&nbsp;&nbsp; "function-name" | tdf_from_expr | "expression"
 <br>%</tt