class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">zppf</span><span class="o">*</span><span class="n">sd</span>
<span class="w">                     </span><span class="n">ix2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">x2</span>
<span class="c">!</span>
<span class="c">!     CHECK AND MODIFY (IF NECESSARY) THIS INITIAL</span>
<span class="c">!     ESTIMATE OF THE PERCENT POINT</span>
<span class="c">!     TO ASSURE THAT IT BE 