nsp;</span>voltage <span  title="" class="an ">&ensp;</span>dependent <span  title="" class="an ">&ensp;</span>increase <span  title="" class="an ">&ensp;</span>a <span  title="" class="an ">&ensp;</span>voltage <span  title="" class="an ">&ensp;</span>dependent <span  title="" class="an ">&ensp;</span>decrease <span  title="" class="an ">&ensp;</span>in <span  title="" class="an ">&ensp;</span>open <span  title="" class="an ">&ensp;</span>probability <span  title="" class="an ">&ensp;</span>Po <span  title