Time average of anomaly correlations for forecasts of 500-hPa heights as a function of forecast day, verifying during the indicated time period for 20-80 deg N (top) and 20-80 deg S (bottom). These "die-off" curves are plotted for total fields and three wave number groups. Numbers of cases for each model are indicated. These "die-off" curves are plotted for zonal waves 1-20 (large curves) and three other wave number groups (inset). Numbers of cases for each model are indicated.