diff --git a/src/gui_qt/main/management.py b/src/gui_qt/main/management.py
index db28c00..ca5b065 100644
--- a/src/gui_qt/main/management.py
+++ b/src/gui_qt/main/management.py
@@ -458,15 +458,13 @@ class UpperManagement(QtCore.QObject):
                 for pos in set_order:
                     set_id = list_ids[pos]
 
-                    data_i = self.data[set_id]
-                    set_params = model_p['data_parameter'][set_id]
                     try:
                         data_i = self.data[set_id]
                     except KeyError as e:
                         raise KeyError(f'{set_id} not found') from e
 
                     try:
-                        set_params = model_p['parameter'][set_id]
+                        set_params = model_p['data_parameter'][set_id]
                     except KeyError as e:
                         raise KeyError(f'No parameter found for {set_id}') from e
 
@@ -487,7 +485,7 @@ class UpperManagement(QtCore.QObject):
                     if fit_limits == 'none':
                         inside = slice(None)
                     elif fit_limits == 'x':
-                        x_lim, _ = self.graphs[self.current_graph].range
+                        x_lim, _ = self.graphs[self.current_graph].ranges
                         inside = np.where((_x >= x_lim[0]) & (_x <= x_lim[1]))
                     else:
                         inside = np.where((_x >= fit_limits[0]) & (_x <= fit_limits[1]))