<p class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal"><span style="FONT-FAMILY: 'Times New Roman','serif'; mso-fareast-font-family: 'Times New Roman'"><font size="3">Dear Mark</font></span></p>
<p class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal"><span style="FONT-FAMILY: 'Times New Roman','serif'; mso-fareast-font-family: 'Times New Roman'"><font size="3"> </font></span></p>
<p class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal"><span style="FONT-FAMILY: 'Times New Roman','serif'; mso-fareast-font-family: 'Times New Roman'"><font size="3">you said in answer to -pbc nojump that using of new xtc file for analysis section depends what one wants to observe.</font></span></p>
<p class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: normal"><span style="FONT-FAMILY: 'Times New Roman','serif'; mso-fareast-font-family: 'Times New Roman'"><font size="3"> </font></span></p>
<p class="MsoNormal" style="MARGIN: 0in 0in 6pt; LINE-HEIGHT: normal"><span style="FONT-FAMILY: 'Times New Roman','serif'; mso-fareast-font-family: 'Times New Roman'"><font size="3">what observations is relevant to periodicity?</font></span></p>
<p class="MsoNormal" style="MARGIN: 0in 0in 10pt"><font face="Calibri" size="3"> </font></p>
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