ABSTRACT
It frequently happens that there are additional rows and columns of data that are not the primary data of interest but that are useful in interpreting features discovered in the primary data. Any additional row (or column) of a data matrix can be positioned on an existing map, as long as the profile of this row (or column) is meaningfully comparable to the existing row (or column) profiles which have determined the map. These additional rows or columns that are added to the map afterwards are called supplementary points.
