diff --git a/script/jan/hyst_Dy_singleenergy.py b/script/jan/hyst_Dy_singleenergy.py
index 53efd33..bd7f1b4 100644
--- a/script/jan/hyst_Dy_singleenergy.py
+++ b/script/jan/hyst_Dy_singleenergy.py
@@ -10,7 +10,7 @@ rrate = 2.0        # ramping speed of mag field
 e1 = 1290.1        # energy 1 (usually on edge)
 e2 = 1283.0        # energy 2 (pre edge)
 
-B1 = 4.0            # field span
+B1 = -4.0            # field span
 B2 = -B1
 nr_loops = 1        # number of loops to acquire
 
@@ -20,6 +20,16 @@ open_valve()
 loop_count = 0
 while loop_count < nr_loops:
 
+    set_pol_cminus(offset = off_cminus)
+    set_file('Dy_hyst_minus')
+    hyst_cont(field_x, B1, B2, rrate, [e1])
+
+    set_pol_cminus(offset = off_cminus)
+    set_file('Dy_hyst_minus')
+    hyst_cont(field_x, B2, B1, rrate, [e1])
+    
+    
+    
     set_pol_cplus(offset = off_cplus)
     set_file('Dy_hyst_plus')
     hyst_cont(field_x, B1, B2, rrate, [e1])