  title="" class="an ">&ensp;</span>for <span  title="" class="an ">&ensp;</span>the <span  title="" class="an ">&ensp;</span>coexpressed <span  title="" class="an ">&ensp;</span>Ih <span  title="" class="an ">&ensp;</span>can <span  title="" class="an ">&ensp;</span>be <span  title="" class="an ">&ensp;</span>reproduced <span  title="" class="an ">&ensp;</span>by <span  title="" class="an ">&ensp;</span>the <span  title="" class="an ">&ensp;</span>linear <span  title="" class="an ">&ensp;</span>sum <span  