new file: .clang-format

	new file:   README.md
	modified:   gem_tracker.xml
	modified:   gps.mac
	new file:   results/.gitignore
	modified:   scripts/tutorial1_hit_position.cxx

.clang-format

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+...

README.md

+# EIC Software tutorial
+
+## Tutorial held on 5/21/2021
+
+### Sessions:
+- 08:30 am - 10:30 am CDT
+- 12:30 am - 02:30 am CDT
+

gem_tracker.xml

@@ -93,14 +93,13 @@
 
   <readouts>
     <readout name="GEMTrackerHits">
+      <!--
       <segmentation type="CartesianGridXY" grid_size_x="1*cm" grid_size_y="3*cm" />
       <id>system:8,barrel:2,layer:4,module:12,sensor:2,x:32:-16,y:-16</id>
-      <!--
-      <segmentation type="PolarGridRPhi" grid_size_phi="5.0*degree" grid_size_r="1.0*cm"/>
-      <id>system:5,barrel:3,layer:4,module:5,r:32:-16,phi:-16</id>
       -->
+      <segmentation type="PolarGridRPhi" grid_size_phi="3.0*degree" grid_size_r="5.0*cm"/>
+      <id>system:5,barrel:3,layer:4,module:5,r:32:-16,phi:-16</id>
     </readout>
-
   </readouts>
 
   <!--

gps.mac

@@ -21,4 +21,4 @@
 /gps/ang/mintheta  30 degree
 /gps/ang/maxtheta  160 degree
 
-/run/beamOn 100
+/run/beamOn 1000

scripts/tutorial1_hit_position.cxx

@@ -87,8 +87,8 @@ void tutorial1_hit_position(const char* fname = "gem_tracker_sim.root") {
   auto d1 = d0.Define("nhits", nhits, {"GEMTrackerHits"})
                 .Filter([=](const std::vector<dd4pod::TrackerHitData>& hits) {
                       for (auto h : hits) {
-                        auto pos = h.position;
-                        if (std::hypot(pos.x,pos.y) > 30.0) {
+                        auto pos = ROOT::Math::XYZVector(h.position.x,h.position.y,h.position.z);
+                        if ((pos.r() > 100.0) && (std::abs(pos.phi()-M_PI/2.0)< M_PI/6)) {
                           return true;
                         }
                       }