diff --git a/requirements.txt b/requirements.txt
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+++ b/requirements.txt
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+alabaster==0.7.12
+astropy==4.0.1.post1
+attrs==19.3.0
+Babel==2.8.0
+bleach==3.1.5
+blessed==1.17.5
+certifi==2020.4.5.1
+chardet==3.0.4
+colorama==0.4.3
+CommonMark==0.5.4
+cursor==1.3.4
+cycler==0.10.0
+decorator==4.4.2
+defusedxml==0.6.0
+docutils==0.16
+enlighten==1.5.1
+entrypoints==0.3
+futures==3.1.1
+idna==2.9
+imagesize==1.2.0
+importlib-metadata==1.6.0
+ipython-genutils==0.2.0
+Jinja2==2.11.2
+jsonschema==3.2.0
+jupyter-core==4.6.3
+jupyter-sphinx-theme==0.0.6
+kiwisolver==1.2.0
+log-symbols==0.0.14
+logging-spinner==0.2.2
+MarkupSafe==1.1.1
+matplotlib==3.2.1
+mistune==0.8.4
+nbconvert==5.6.1
+nbformat==5.0.6
+nbsphinx==0.7.0
+numpy==1.18.2
+packaging==20.4
+pandocfilters==1.4.2
+pprintpp==0.4.0
+pyfiglet==0.8.post1
+Pygments==2.6.1
+pyparsing==2.4.7
+pyrsistent==0.16.0
+pyspin==1.1.1
+python-dateutil==2.8.1
+pytz==2020.1
+quantities==0.12.4
+recommonmark==0.4.0
+requests==2.23.0
+rich==1.1.6
+scipy==1.4.1
+six==1.14.0
+snowballstemmer==2.0.0
+Sphinx==3.0.3
+sphinx-rtd-theme==0.4.3
+sphinxcontrib-applehelp==1.0.2
+sphinxcontrib-devhelp==1.0.2
+sphinxcontrib-htmlhelp==1.0.3
+sphinxcontrib-jsmath==1.0.1
+sphinxcontrib-qthelp==1.0.3
+sphinxcontrib-serializinghtml==1.1.4
+stsci-rtd-theme==0.0.2
+termcolor==1.1.0
+testpath==0.4.4
+tqdm==4.46.0
+traitlets==4.3.3
+typing-extensions==3.7.4.2
+urllib3==1.25.9
+wcwidth==0.1.9
+webencodings==0.5.1
+zipp==3.1.0