The second column incorporates a bidirectional bar chart. Increases are painted in red and to the right, while decreases are painted in green and to the left. In the view settings dialog you can choose whether you want this bar chart to display absolute changes or the percentage of the change. The other value is displayed in parentheses. This setting also determines how this column is sorted.
The second column can show either size or instances. This is configurable in the view settings dialog and is called the primary measure.Please note that if the current comparison compares "All objects" (see above), the numbers will likely not correspond with the object comparison since the allocation comparisons only compare recorded objects.