Copyright (C) 2019, the scikit-image team

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skimage/_shared/version_requirements.py:_check_version

Copyright (c) 2013 The IPython Development Team

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skimage/_shared/version_requirements.py:is_installed:

Original Copyright (C) 2009-2011 Pierre Raybaut

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skimage/external/tifffile:

Copyright (c) 2008-2014, The Regents of the University of California
Produced at the Laboratory for Fluorescence Dynamics

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