diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..90f8fbb
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,176 @@
+# Created by https://www.toptal.com/developers/gitignore/api/python
+# Edit at https://www.toptal.com/developers/gitignore?templates=python
+
+### Python ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+
+### Python Patch ###
+# Poetry local configuration file - https://python-poetry.org/docs/configuration/#local-configuration
+poetry.toml
+
+# ruff
+.ruff_cache/
+
+# LSP config files
+pyrightconfig.json
+
+# End of https://www.toptal.com/developers/gitignore/api/python
\ No newline at end of file
diff --git a/brain_average.csv b/brain_average.csv
deleted file mode 100644
index d30573e..0000000
--- a/brain_average.csv
+++ /dev/null
@@ -1 +0,0 @@
-10.5,11.5,12.5,13.5,14.5,15.5,16.5,17.5,18.5,19.5,20.5,21.5,22.5,23.5,24.5,25.5,26.5,27.5,28.5,29.5
diff --git a/brain_sample.csv b/brain_sample.csv
deleted file mode 100644
index 7b809c6..0000000
--- a/brain_sample.csv
+++ /dev/null
@@ -1,20 +0,0 @@
-1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20
-2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21
-3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22
-4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23
-5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24
-6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25
-7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26
-8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27
-9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28
-10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29
-11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30
-12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31
-13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32
-14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33
-15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34
-16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35
-17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36
-18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37
-19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38
-20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..b32f98d
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,12 @@
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "sagittal_average"
+version = "0.1.0"
+
+[tool.hatch.build.targets.wheel]
+packages = [
+  "src/sagittal_average",
+]
\ No newline at end of file
diff --git a/sagittal_brain.py b/src/sagittal_average/sagittal_brain.py
similarity index 96%
rename from sagittal_brain.py
rename to src/sagittal_average/sagittal_brain.py
index c257fc9..27a4120 100644
--- a/sagittal_brain.py
+++ b/src/sagittal_average/sagittal_brain.py
@@ -16,7 +16,7 @@ def run_averages(file_input='brain_sample.csv', file_output='brain_average.csv')
 
     # Calculates the averages through the sagittal/horizontal planes
     # and makes it as a row vector
-    averages = planes.mean(axis=0)[np.newaxis, :]
+    averages = planes.mean(axis=1)[np.newaxis, :]
 
     # write it out on my file
     np.savetxt(file_output, averages, fmt='%.1f', delimiter=',')
diff --git a/tests/brain_average.csv b/tests/brain_average.csv
new file mode 100644
index 0000000..af02e18
--- /dev/null
+++ b/tests/brain_average.csv
@@ -0,0 +1 @@
+0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,1.0
diff --git a/tests/brain_sample.csv b/tests/brain_sample.csv
new file mode 100644
index 0000000..d0b9035
--- /dev/null
+++ b/tests/brain_sample.csv
@@ -0,0 +1,20 @@
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
diff --git a/tests/test_sagittal_brain.py b/tests/test_sagittal_brain.py
new file mode 100644
index 0000000..397151e
--- /dev/null
+++ b/tests/test_sagittal_brain.py
@@ -0,0 +1,23 @@
+import numpy as np
+from sagittal_average.sagittal_brain import run_averages
+from pathlib import Path
+
+TEST_DIR = Path(__file__).parent   
+
+def test_average():
+    # Creates input file
+    data_input = np.zeros((20, 20))
+    data_input[-1, :] = 1
+    # The expeted result is all zeros, except the last one, it should be 1
+    expected = np.zeros(20)
+    expected[-1] = 1
+
+    np.savetxt(TEST_DIR / "brain_sample.csv", data_input, fmt='%d', delimiter=',')
+
+    # run python program
+    run_averages(file_input=TEST_DIR / "brain_sample.csv",
+                 file_output=TEST_DIR / "brain_average.csv")
+
+    # Check result
+    result = np.loadtxt(TEST_DIR / "brain_average.csv",  delimiter=',')
+    np.testing.assert_array_equal(result, expected)   
\ No newline at end of file