----------------------------------</span>
<span class="w">      </span><span class="n">an</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">N</span>
<span class="w">      </span><span class="n">iupper</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">7500</span>
<span class="c">!</span>
<span class="c">!     CHECK THE INPUT ARGUMENTS FOR ERRORS</span>
<span class="c">!</span>
<span class="w">      </span><span class="k"