Data objects are blocks of data imported or paste-linked from elsewhere. You can't edit these data on that table either because the data are linked to an external text file or to another table in the same Prism project. Data blocks appear with thick borders.
The example above has a red border, because the data were copied and then paste-linked from a red results table. If the values were pasted from a green results table, the border would be green. Green results tables are organized like data tables and (unlike red results tables) can be graphed or further analyzed. If the data were paste linked from another data table, the border is blue. If the data are linked to an external file, the border is black.