diff --git a/wferrors.py b/wferrors.py
index c4955a4..e80c08f 100644
--- a/wferrors.py
+++ b/wferrors.py
@@ -97,9 +97,9 @@ def amplitude_phase_modification_fd(**kwds):
                 + delta_phase
             )
     elif dict_waveform_modification['modification_type'] == 'cubic_spline_nodes':
-        f_lower = (dict_waveform_modification.get('f_lower_wferror',
+        f_lower = dict_waveform_modification.get('f_lower_wferror',
             default=dict_waveform_modification['f_lower'])
-            )
+
         f_high_wferror = dict_waveform_modification['f_high_wferror']
         n_nodes_wferror = int(dict_waveform_modification['n_nodes_wferror'])
         wf_nodal_points = numpy.logspace(
@@ -241,9 +241,9 @@ def amplitude_phase_modification_both_polarization_fd(**kwds):
             ) + delta_phase_cross
 
     elif modification_type == 'cubic_spline_nodes':
-        f_lower = (dict_waveform_modification.get('f_lower_wferror', 
+        f_lower = dict_waveform_modification.get('f_lower_wferror', 
             default=dict_waveform_modification['f_lower'])
-            )
+
         f_high_wferror = dict_waveform_modification['f_high_wferror']
         n_nodes_wferror = int(dict_waveform_modification['n_nodes_wferror'])