Fig. 4 Decay curves of 500-mb anomaly correlations for geopotential
as a function of forecast length, averaged over all July-Aug cases (N=35).
Northern Hemisphere on top, Southern Hemisphere on the bottom.
The three models of interest are the then-operational T170 MRF in black
and the new T126 and T170 corrected versions under consideration here.
The dotted red lines are the T126; the solid green lines are new T170.
Northern Hemisphere is on top and Southern Hemisphere on the bottom, as
in Fig. 3.