diff --git a/easyDiffractionApp/Logic/Fitting.py b/easyDiffractionApp/Logic/Fitting.py
index 9fd76e90..f122054d 100644
--- a/easyDiffractionApp/Logic/Fitting.py
+++ b/easyDiffractionApp/Logic/Fitting.py
@@ -67,6 +67,17 @@ def fit_threading(self):
 
         x = exp_data.x
         y = exp_data.y
+        component = self.parent.l_experiment.spinComponent()
+        is_polar = self.parent.l_experiment.spin_polarized
+        y = exp_data.y + exp_data.yb
+        if is_polar:
+            if component == "Difference":
+                y = exp_data.y - exp_data.yb
+            elif component == "Up":
+                y = exp_data.y
+            elif component == "Down":
+                y = exp_data.yb
+
         weights = 1 / exp_data.e
 
         kwargs = {