up></font><font face="Arial" color="#000100" size="2"> 
</font><font face="Arial" color="#000100" size="3">exp(-e
</font><font face="Symbol" color="#000100" size="3"><strong><sup>b
</sup></strong></font><font face="Arial" color="#000100" size="3"><strong><sup>z
</sup></strong></font><font face="Arial" color="#000100" size="2"><sup>i
</sup></font><font face="Arial" color="#000100" size="3"><sup>t
</sup></font><font face="Arial" color="#000100" size="2"><sup>i
</sup></font><font face="Arial" color="#000100" s