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-rw-r--r--gerbonara/apertures.py17
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diff --git a/gerbonara/apertures.py b/gerbonara/apertures.py
index d717d36..ec14f16 100644
--- a/gerbonara/apertures.py
+++ b/gerbonara/apertures.py
@@ -1,3 +1,20 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright 2022 Jan Götte <code@jaseg.de>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
import math
from dataclasses import dataclass, replace, field, fields, InitVar, KW_ONLY