crystals     >= 1, < 2
npstreams    >= 1.6.1,  < 2
numpy        >= 1.13, < 2
pywavelets   >= 1.0.0
scikit-image >= 0.15
scipy        >= 1.0.0
tifffile     >= 0.13
pyyaml       >= 3.1
matplotlib   >= 3.0.0, <4