Look at the table from the Backlink Gap tool. What do the numbers in the last five columns show?

Answer

The total number of analyzed domains that a specific referring domain (listed in the first column) links to
How many backlinks from referring domains (listed in the first row) each of the analyzed domains (listed in the first column) has
How many backlinks from referring domains (listed in the first column) each of the analyzed domains (listed in the first row) has
The total number of analyzed domains that a specific referring domain (listed in the first row) links to