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  • 4-regime scheme.  Shown as cumulative histograms using a four regime scheme (NAO+, NAO-, Blocking, ATR) where NAO denotes North Atlantic Oscillation, and ATR denotes Atlantic ridge.  The signs show positive or negative characteristics.  All regimes are independent of one another.  There is also a fifth category of no (clearcutclear-cut) regime.  This scheme is used to construct regime frequency histograms.
  • Mirrored 2-regime scheme.  Shown as phase-space diagrams using a two regime scheme ( NAO and BL) where NAO denotes North Atlantic Oscillation and BL denotes Blocking (both represented somewhat differently to the 4-regime scheme).   Each has a negative and a positive component that are in both cases exactly opposite to one another; these are NAO+/- and BL+/-. There is also a fifth category of no (clearcutclear-cut) regime which would be denoted by the area close to the centre of the phase-space diagram.  This scheme is used to construct to construct Phase Space or Regime Projection diagrams.

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