crystals     >= 1.1.2, < 2
npstreams    >= 1.6.2,  < 2
numpy        >= 1.15, < 2
pywavelets   >= 1.0.0
scikit-image >= 0.17, <1
scipy        >= 1.0.0
pyyaml       >= 3.1
matplotlib   >= 3.0.0, <4