The calendar year the figures cover.

The month the figures cover, as a number from 1 to 12.

The month the figures cover, as a three-letter abbreviation such as JAN.

The name of the airspace entity, such as an ANSP, a functional airspace block or a whole area like the SES area.

What kind of entity the row is, and whether its airspace is defined by ANSP areas of responsibility (AUA) or by flight information regions (FIR).

The number of flights that flew through the entity's airspace.

Minutes of en-route ATFM delay, all causes together.

Minutes of en-route ATFM delay caused by accidents and incidents (delay code A).

Minutes of en-route ATFM delay caused by ATC capacity (delay code C).

Minutes of en-route ATFM delay caused by de-icing (delay code D).

Minutes of en-route ATFM delay caused by non-ATC equipment (delay code E).

Minutes of en-route ATFM delay caused by aerodrome capacity (delay code G).

Minutes of en-route ATFM delay caused by industrial action by ATC (delay code I).

Minutes of en-route ATFM delay caused by airspace management (delay code M).

Minutes of en-route ATFM delay caused by industrial action outside ATC (delay code N).

Minutes of en-route ATFM delay caused by other causes (delay code O).

Minutes of en-route ATFM delay caused by special events (delay code P).

Minutes of en-route ATFM delay caused by ATC routeings (delay code R).

Minutes of en-route ATFM delay caused by ATC staffing (delay code S).

Minutes of en-route ATFM delay caused by ATC equipment (delay code T).

Minutes of en-route ATFM delay caused by environmental issues (delay code V).

Minutes of en-route ATFM delay caused by weather (delay code W).

Minutes of en-route ATFM delay caused by unspecified causes (delay code NA).

The number of flights that had en-route ATFM delay.

The number of flights that had more than 15 minutes of en-route ATFM delay.

Which version of the ATFM delay calculation produced the figures. The Network Manager changed the calculation on 4 April 2016 (v1 before, v2 after), and v3 marks figures with post-operations adjustments.