How can I calculate the NAIRU value here? Could you please help me?

QUESTION A1 The figure below depicts a series of Short-Run Phillips Curves (SRPC) for a hypothetical economy. Each SRPC is labeled with a number indicating the level of expected inflation associated with it. For example, the SRPC2 curve is the SRPC associated with expected inflation of 2%. Based on the figure, what is the current value of the non-accelerating inflation rate of unemployment (NAIRU) in this economy? (Note: you are being asked for a numerical answer.) Explain your answer. 14 0% 12 09% 6.07% INFLATION RATE 4.0/ SAPCS 2.0%% SPPC6 0.0%% SAPC4 0.0% 1.0% 20% 3.0%% 4.0% 5.0% 6.0% 8.0% -20%% SAPC2 -4.0# UNEMPLOYMENT RATE