HIND_CTRL(uten 2005-2007) Ocean Heat Content heterogeneous Anomaly Correlation(AC), 1-4 lead season

Following Becker et al. 2014 approach ( 10.1175/JCLI-D-13-00597.1 ) 1-4 lead seasonal forecast correlation. 

The correlation is 100m OHC between EN4 4.2.1 analysis and ensemble mean of simulation members.