--- projects/lcsim/trunk/detector-framework/src/main/java/org/lcsim/detector/tracker/silicon/HpsSiSensor.java	2014-10-11 19:04:14 UTC (rev 3359)
+++ projects/lcsim/trunk/detector-framework/src/main/java/org/lcsim/detector/tracker/silicon/HpsSiSensor.java	2014-10-13 05:49:33 UTC (rev 3360)
@@ -30,6 +30,9 @@

 	public final static int T0_INDEX = 1;
 	public final static int TP_INDEX = 2;
 	

+	public final static String ELECTRON_SIDE = "ELECTRON";
+	public final static String POSITRON_SIDE = "ELECTRON";
+	

 	protected int febID; 
 	protected int febHybridID;
 	protected double t0Shift = 0;

@@ -242,8 +245,18 @@

 	public double getT0Shift() {
 		return t0Shift;
 	}

-

+	/**
+	 * Get the sensor side (ELECTRON or POSITRON).  For single sensor 
+	 * half-modules, the side will always be ELECTRON.
+	 * 
+	 * @return The side the sensor is on (ELECTRON or POSITRON)
+	 */
+	public String getSide(){
+		return this.getModuleNumber() < 2 ? ELECTRON_SIDE : POSITRON_SIDE;
+	}
+	
+	

     /** 
      * Generate an ID for a channel (strip) on a sensor.
      *