diff --git a/script/scans/SampleSearch.py b/script/scans/SampleSearch.py
index 16166bf..e7bc8d1 100644
--- a/script/scans/SampleSearch.py
+++ b/script/scans/SampleSearch.py
@@ -16,9 +16,11 @@ sensor = scd_sim if SIMULATION else scd
 
 X_MIN, X_MAX, Y_MIN, Y_MAX = float(X_MIN), float(X_MAX), float(Y_MIN), float(Y_MAX)
 
+step=0
 for y in frange(Y_MIN, Y_MAX, Y_STEP):   
     scy.move(y)
-    r = cscan(scx, sensor, scx.minValue, scx.maxValue, 0.01, latency = DIODE_SETTLING_TIME)
+    scan_range = [scx.minValue, scx.maxValue] if (step % 0==0) else [scx.maxValue, scx.minValue]
+    r = cscan(scx, sensor, scan_range[0], scan_range[1], 0.01, latency = DIODE_SETTLING_TIME)
 
     try:
         xdata = enforce_monotonic(r.getPositions(0))
@@ -38,7 +40,7 @@ for y in frange(Y_MIN, Y_MAX, Y_STEP):
         break        
     except:
         print "Invalid x fit for y=", y
-
+    step += 1
 
 r = cscan(scy, sensor, scy.minValue, scy.maxValue, 0.01, latency = DIODE_SETTLING_TIME)
 xdata = enforce_monotonic(r.getPositions(0))