Figure 2: (a) Mean bias between COADS Qa and ANN Qa. (b) Mean bias between COADS Qa and Qa derived from the W-Qa relationship of Liu (1986). Scale is in (g kg-1), and the time period is for the testing sample (August 1988-July 1989 and August 1992-July 1993). Places marked with "X" denote missing data.