FCCUBIC_FUNC
This is part of the symfunc module
It is only available if you configure PLUMED with ./configure –enable-modules=symfunc . Furthermore, this feature is still being developed so take care when using it and report any problems on the mailing list.

Measure how similar the environment around atoms is to that found in a FCC structure.

Examples
Glossary of keywords and components
Compulsory keywords
ALPHA ( default=3.0 ) The alpha parameter of the angular function
Options
ARG the input to this function. You can use multiple instances of this keyword i.e. ARG1, ARG2, ARG3...