<html><head></head><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:16px"><div id="yiv8355482844"><div id="yui_3_16_0_ym19_1_1479353411685_9419"><div style="color:#000;background-color:#fff;font-family:times new roman, new york, times, serif;font-size:16px;" id="yui_3_16_0_ym19_1_1479353411685_9418"><div id="yiv8355482844"><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_6504"><div style="color:#000;background-color:#fff;font-family:times new roman, new york, times, serif;font-size:16px;" id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_6503"><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4824"><span></span></div><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4824"><span id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4869">Hi everyone,</span></div><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4824"><span><br></span></div><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4824"><span id="yui_3_16_0_ym19_1_1479353411685_9465">Currently I investigate positron range measurement in different media with ROOT file output.</span></div><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4824" dir="ltr"><span id="yui_3_16_0_ym19_1_1479353411685_9543">When I simulate for example F-18 in water with 5 million events, the output that of interest are Positron_annihil_distance(with histogram sign), and GATE tree file. However, there are 2 GATE tree files naming GATE;1 and GATE;2. Why there is such GATE 1 and GATE 2?</span></div><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4824" dir="ltr"><span><br></span></div><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4824" dir="ltr"><span id="yui_3_16_0_ym19_1_1479353411685_10162">Another issue is, in the GATE tree file, there is also the leaf called posannihildist. </span> I thought it is the same as Positron_annihil_distance(with histogram sign) until I noticed the difference of mean value in this respective file when I simulated O-15, C-11 and Ga-68 in lung.</div><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4824" dir="ltr"><br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1479353411685_10168"><span id="yui_3_16_0_ym19_1_1479353411685_10180">What is this leaf file tell us?What is the different as compared to the </span>Positron_annihil_distance(with histogram sign)?</div><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4824" dir="ltr">Any help is appreciated. Thank you.</div><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4824" dir="ltr"><br></div><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4824" dir="ltr">Regards,</div><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4824" dir="ltr">Rukiah</div><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4824" dir="ltr"><br></div><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4824" dir="ltr"><br></div><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4824"><span><br></span></div><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4824"><span><br></span></div><div></div><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4831"> </div><div class="yiv8355482844signature" id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4833"><div id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4832"><font color="#00007f" face="bookman old style, new york, times, serif"></font> </div><div style="color:rgb(0, 0, 0);font-family:bookman old style, new york, times, serif;font-size:13px;font-style:normal;background-color:transparent;" id="yiv8355482844yui_3_16_0_ym19_1_1479353411685_4836"><br></div></div></div></div></div></div></div></div></div></body></html>