diff --git a/pylot/core/pick/autopick.py b/pylot/core/pick/autopick.py
index 89665616..9a8c7bc7 100644
--- a/pylot/core/pick/autopick.py
+++ b/pylot/core/pick/autopick.py
@@ -836,8 +836,7 @@ class AutopickStation(object):
         if self.p_params.algoP == 'HOS':
             self.cf1 = HOScf(z_copy, cuttimes, self.pickparams)
         elif self.p_params.algoP == 'ARZ':
-            self.cf1 = ARZcf(z_copy, cuttimes, self.p_params.tpred1z, self.p_params.Parorder, self.p_params.tdet1z,
-                        self.p_params.addnoise)
+            self.cf1 = ARZcf(z_copy, cuttimes, self.pickparams["tdet1z"], self.pickparams["tpred1z"], self.pickparams)
         else:
             self.cf1 = None
         assert isinstance(self.cf1, CharacteristicFunction), 'cf1 is not set correctly: maybe the algorithm name ({})' \
@@ -886,7 +885,7 @@ class AutopickStation(object):
         if self.p_params.algoP == 'HOS':
             self.cf2 = HOScf(z_copy, cuttimes2, self.pickparams)
         elif self.p_params.algoP == 'ARZ':
-            self.cf2 = ARZcf(z_copy, cuttimes2, self.p_params.tpred2z, self.p_params.Parorder, self.p_params.tdet2z, self.p_params.addnoise)
+            self.cf2 = ARZcf(z_copy, cuttimes2, self.pickparams["tdet2z"], self.pickparams["tpred2z"], self.pickparams)
         else:
             self.cf2 = None
         assert isinstance(self.cf2, CharacteristicFunction), 'cf2 is not set correctly: maybe the algorithm name () is ' \
diff --git a/pylot/core/pick/charfuns.py b/pylot/core/pick/charfuns.py
index 2b0ff706..ec879865 100644
--- a/pylot/core/pick/charfuns.py
+++ b/pylot/core/pick/charfuns.py
@@ -306,6 +306,9 @@ class HOScf(CharacteristicFunction):
 
 class ARZcf(CharacteristicFunction):
 
+    def __init__(self, data, cut, t1, t2, pickparams):
+        super(ARZcf, self).__init__(data, cut, t1=t1, t2=t2, order=pickparams["Parorder"], fnoise=pickparams["addnoise"])
+
     def calcCF(self, data):
         """
         function used to calculate the AR prediction error from a single vertical trace. Can be used to pick