has tier
Asociates an ARTCC with the set of ARTCCs in its nth level tier. Tier 1 includes the central ARTCC plus all ARTCCs immediately adjoining the central ARTCC; tier 2 includes tier 1 plus all adjacent ARTCCs two steps away from the central ARTCC. And so on.
has tier
Asociates an ARTCC with the set of ARTCCs in its nth level tier. Tier 1 includes the central ARTCC plus all ARTCCs immediately adjoining the central ARTCC; tier 2 includes tier 1 plus all adjacent ARTCCs two steps away from the central ARTCC. And so on.
comment
Asociates an ARTCC with the se ...... the central ARTCC. And so on.