diff --git a/semeio/workflows/localisation/local_script_lib.py b/semeio/workflows/localisation/local_script_lib.py
index 2c4a2aab2..9d1111ebf 100644
--- a/semeio/workflows/localisation/local_script_lib.py
+++ b/semeio/workflows/localisation/local_script_lib.py
@@ -6,7 +6,7 @@
 import math
 from collections import defaultdict
 from dataclasses import dataclass, field
-from typing import Dict, List
+from typing import Dict, List, Any
 
 import cwrap
 import numpy as np
@@ -26,6 +26,10 @@
     debug_print,
 )
 
+try:
+    from typing import Self
+except ImportError:
+    from typing_extensions import Self
 
 @dataclass
 class Parameter:
@@ -262,7 +266,7 @@ def write_qc_parameter_surface(
         reference_surface_file: str,
         param_for_surface: object,
         log_level=LogLevel.OFF,
-    ):
+    )->None:
         # pylint: disable=too-many-arguments
 
         if param_for_surface is None or surface_scale is None:
@@ -365,8 +369,9 @@ def build_decay_object(
     grid: object,
     use_cutoff: bool,
     tapering_range: float = 1.5,
-) -> Decay:
+) -> Any:
     # pylint: disable=too-many-arguments
+    decay_obj = None
     if method == "gaussian_decay":
         decay_obj = GaussianDecay(
             ref_pos,
@@ -463,7 +468,7 @@ def apply_decay(
     perp_range: float,
     azimuth: float,
     use_cutoff: bool = False,
-    tapering_range: float = None,
+    tapering_range: float = 1.5,
     calculate_qc_parameter: bool = False,
 ):
     # pylint: disable=too-many-arguments,too-many-locals
@@ -507,7 +512,7 @@ def apply_constant(
     grid: object,
     value: float,
     log_level: LogLevel,
-    calculate_qc_parameter=False,
+    calculate_qc_parameter: bool = False,
 ):
     # pylint: disable=too-many-arguments,too-many-locals
     """