Color palette
26 distinct colors (Zeileis(2009): Escaping RGBland: Selecting Colors for Statistical Graphics)
colpal4
A vector with 26 color hex-codes
http://eeecon.uibk.ac.at/~zeileis/papers/Zeileis+Hornik+Murrell-2009.pdf
Modeling Framework for Cellular Communities in their Environments
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