1Import excel files into R. Supports '.xls' via the embedded 'libxls' C library 2<https://github.com/libxls/libxls> and '.xlsx' via the embedded 'RapidXML' C++ 3library <http://rapidxml.sourceforge.net>. Works on Windows, Mac and Linux 4without external dependencies. 5 6See also <https://cran.r-project.org/package=readxl>. 7