Figure 2From: Fair greening of broadband access: spectrum management for energy-efficient DSL networksGreening vector ΔP can result in different rate reductions ΔR, ΔR A and ΔR B. ΔR can be decomposed into two dimensions ('price of greening' dimension g and fairness dimension f) given by the projections P f ( Δ R ) and P g( Δ R ) , respectively.Back to article page