diff --git a/Scripts/Spin_Alignment_Four_Pulses/spinal4pulses_exp.py b/Scripts/Spin_Alignment_Four_Pulses/spinal4pulses_exp.py
index 076a717..f0c941c 100644
--- a/Scripts/Spin_Alignment_Four_Pulses/spinal4pulses_exp.py
+++ b/Scripts/Spin_Alignment_Four_Pulses/spinal4pulses_exp.py
@@ -106,7 +106,7 @@ def spinal4pulses_experiment(pars, run):
                        
    # 8-step phase cycle (Schaefer et al. J Magn Res A 115 (1995))
     pars['PH1'] = [0,    0, 180, 180,  90, 90, 270, 270] # 1st (90-degree) pulse
-    pars['PH3'] = [90, 270,  90, 270, 180, 90, 180,  90] # 2nd (90-degree) pulse
+    pars['PH3'] = [90, 270, 270,  90, 180,  0,   0, 180] # 2nd (90-degree) pulse
     pars['PH4'] = [90] # 3rd (90-degree) pulse
     pars['PH5'] = [90] * 8 + [270] * 8
     pars['PH2'] = [90, 270]  # receiver