<div dir="ltr"><div><span style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif">Dear All</span></div><span style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif">How i can obtain the value of tau from my calculated electronic conductivity and from the experimental electronic conductivity.</span><br><div><span style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif">Regards</span></div><div><span style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif">Azam</span></div></div>