Correct komma in SPDX Copyright Text and add Citation of tool box in SPDX

.gitignore

-# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences Potsdam, Germany
+# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences, Potsdam, Germany
 # SPDX-License-Identifier: BSD-3-Clause
 
 # Ignore IDE

CHANGELOG.md

 <!--
-SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences Potsdam, Germany
+SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences, Potsdam, Germany
 SPDX-License-Identifier: BSD-3-Clause
 -->
 

example_data/region.gmt

-# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences Potsdam, Germany
+# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences, Potsdam, Germany
 # SPDX-License-Identifier: BSD-3-Clause
 7.5	51.5
 8.5	51.5

example_data/region.txt

-# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences Potsdam, Germany
+# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences, Potsdam, Germany
 # SPDX-License-Identifier: BSD-3-Clause
 7.5 50.5
 7.5 51.5

example_data/region2.txt

-# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences Potsdam, Germany
+# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences, Potsdam, Germany
 # SPDX-License-Identifier: BSD-3-Clause
 300.5 -5.5
\ No newline at end of file

run_regional_tws_uncertainty.sh

 #!/bin/bash
-# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences Potsdam, Germany
+# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences, Potsdam, Germany
 # SPDX-License-Identifier: BSD-3-Clause
 
 

src/__main__.py

-# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences Potsdam, Germany
+# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences, Potsdam, Germany
 # SPDX-License-Identifier: BSD-3-Clause
+# SPDX-FileCopyrightText: When using this code, please cite: "Boergens, Eva (2021): Python Package Regional TWS Uncertainty. GFZ Data Services. https://doi.org/10.5880/GFZ.1.3.2021.005"
 """
 This is the main file to invoke the regional tws uncertainty routines.
 """

src/covariance.py

-# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences Potsdam, Germany
+# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences, Potsdam, Germany
 # SPDX-License-Identifier: BSD-3-Clause
+# SPDX-FileCopyrightText: When using this code, please cite: "Boergens, Eva (2021): Python Package Regional TWS Uncertainty. GFZ Data Services. https://doi.org/10.5880/GFZ.1.3.2021.005"
 """
 Functions handling the computation of the covariances and uncertainties
 """

src/input_arguments.py

-# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences Potsdam, Germany
+# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences, Potsdam, Germany
 # SPDX-License-Identifier: BSD-3-Clause
+# SPDX-FileCopyrightText: When using this code, please cite: "Boergens, Eva (2021): Python Package Regional TWS Uncertainty. GFZ Data Services. https://doi.org/10.5880/GFZ.1.3.2021.005"
 """
 Functions checking the input parameter
 """

src/io.py

-# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences Potsdam, Germany
+# SPDX-FileCopyrightText: `2021 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences, Potsdam, Germany
 # SPDX-License-Identifier: BSD-3-Clause
+# SPDX-FileCopyrightText: When using this code, please cite: "Boergens, Eva (2021): Python Package Regional TWS Uncertainty. GFZ Data Services. https://doi.org/10.5880/GFZ.1.3.2021.005"
 """
 Functions handling input and output
 """