# Data Dimension Mapping

When you use TERR or open-source R expression functions or data functions in Spotfire, you must know how the supported data dimensions are mapped between TERR (or open-source R) and Spotfire.

Spotfire data dimension | TERR and open-source R data dimension
--- | ---
Value | Vector of length 1
Column | Vector
Data table | data.frame

Note: Open-source R is available under separate open source software license terms and is not part of TERR. As such, open-source R is not within the scope of your license for TERR. Open-source R is not supported, maintained, or warranted in any way by Cloud Software Group, Inc. Download and use of open-source R is solely at your own discretion and subject to the free open source license terms applicable to open-source R.