Time average of anomaly correlations for forecasts of v-component of wind, 20S-20N
as a function of forecast day, verifying during the indicated time period
for 200 mb (top) and 850mb (bottom).
These "die-off" curves are plotted for zonal waves 1-20 (large curves) and three
other wave number groups (inset). Numbers(N) of cases for each model
are given in legend box.