<html><head><style type="text/css"></style></head><body><div style="font-family:tahoma, new york, times, serif;font-size:8pt;color:#000000;"><DIV></DIV> <DIV>Hi</DIV> <DIV> </DIV> <DIV>I designed a PET scanner that has a exclusive geometry and it was not possible to define it as a pre-defined PET systems in GATE.</DIV> <DIV>But now, I can't have the "gateCoincidences.dat" output or even ".ROOT" output. What should I do?<BR> </DIV><FONT face="garamond, new york, times, serif" color=#0000bf><STRONG>Navid Zeraatkar</STRONG></FONT> <DIV></DIV></div><br> </body></html>