nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
PULSE(3:3):


        Source sign flipping.</p>
      <p style="font-family: monospace;" class="MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
'+'
don't


        flip it (recommended)</p>
      <p style="font-family: monospace;" class="MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
'-'
flip


        it</p>
      <p style="font-family: monospace;" class="MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;