diff --git a/lisainstrument/shift_inversion_numpy.py b/lisainstrument/shift_inversion_numpy.py
index 57e1563a3668c211857c72d307f1a334eb80ff91..fddcb517d48284d6fa4d9a95ee6b2bb72c9a2041 100644
--- a/lisainstrument/shift_inversion_numpy.py
+++ b/lisainstrument/shift_inversion_numpy.py
@@ -1,31 +1,25 @@
 """Functions for inverting a 1D (time)coordinate transform given as numpy array
 
-The inversion function internally requires an interpolation operator implementing the 
-RegularInterpolator interface, and which is provided by the user. Use 
-make_shift_inverse_lagrange_numpy to create an inversion operator employing Lagrange 
+The inversion function internally requires an interpolation operator implementing the
+RegularInterpolator interface, and which is provided by the user. Use
+make_shift_inverse_lagrange_numpy to create an inversion operator employing Lagrange
 interpolation.
 """
 
 from __future__ import annotations
 
-# ~ from dataclasses import dataclass
-
-# ~ from enum import Enum
 from typing import Final
 
 import numpy as np
 
-# ~ from typing_extensions import assert_never
-
 from lisainstrument.fir_filters_numpy import NumpyArray1D
 from lisainstrument.regular_interpolators import (
     RegularInterpolator,
     make_regular_interpolator_lagrange,
-    # ~ make_regular_interpolator_linear,
 )
 
 
-class ShiftInverseNumpy: # pylint: disable=too-few-public-methods
+class ShiftInverseNumpy:  # pylint: disable=too-few-public-methods
     """Invert coordinate transformation given as shift"""
 
     def __init__(