diff --git a/phases/models/antiparallel_model.py b/phases/models/antiparallel_model.py
index c2903cd..7214da5 100644
--- a/phases/models/antiparallel_model.py
+++ b/phases/models/antiparallel_model.py
@@ -1,3 +1,4 @@
+import math
 import numpy as np
 from scipy.optimize import fsolve
 
@@ -29,6 +30,8 @@ def K2gap(Kval, fitparam):
 
 
 def antiparallel_rad2k_fit(radial, phi_in_degree, undudict):
+    key = "anti-parallel-" if phi_in_degree < 0 else "anti-parallel+"
+    undudict = undudict[key]["K-value"]
     phi = math.radians(phi_in_degree)
     amp1 = getfit(radial, undudict['fitpars_amp1'])
     amp2 = getfit(radial, undudict['fitpars_amp2'])
@@ -52,6 +55,8 @@ def getfit(val, fitparam):
 
 
 def antiparallel_k2rad_fit(Kval, phi_in_degree, undudict):
+    key = "anti-parallel-" if phi_in_degree < 0 else "anti-parallel+"
+    undudict = undudict[key]["K-value"]
     phi = math.radians(phi_in_degree)
     amp1 = getfit(Kval, undudict['fitpars_amp1'])
     amp2 = getfit(Kval, undudict['fitpars_amp2'])