An xyz internal table specifies location in Cartesian coordinates, and the data set must contain an identifier specifying that it is an xyz table. It also needs a list of identifiers corresponding to the "columnar data" in the file. The columnar data must contain the Cartesian coordinates (x and y are only required for two-dimensional simulations) as well as the scalar data. An example of the file format is given in Xyz Internal Table File Format. It is represented in the object tree by a node that has properties and a pop-up menu.
The interpolation method for xyz tabular data is zeroth order. When interpolating the data to a specific cell or face location, STAR-CCM+ will find the coordinate location in the tabular data that is closest to the specific cell or face centroid, and apply the appropriate scalar data from the table to that cell or face.