tyle="height:0.34480000000000005em;"><span style="top:-2.5198em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathnormal mtight">a</span><span class="mrel mtight">∼</span><span class="mord mathnormal mtight" style="margin-right:0.03588em;">π</span><span class="mopen mtight">(</span><span class="mord mathnormal mtight">s</span><span class="mclose mtight">)</span></span></span