The open-source Chemistry Land-surface Atmosphere Soil Slab (CLASS) model can be downloaded free of charge from [www.cambridge.org/vila]. The software runs on default installations of Microsoft Windows (XP, 7 and 8) and Mac OS X (10.6–10.10), and can be compiled on Linux distributions supporting Qt (versions 4 and 5). The source code is hosted by GitHub (http://classmodel.github.io/), where incremental updates to the code can be found. Major bug fixes and updates will always be made available through updates on the Cambridge website.
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