They comply with standards generally. Each Analysis Center can provide a whole series of products. Combination of analysis results is used as a check and for quality control. A weighted averaged is produced currently at NRCanada. Gerhard Beutler noted that stations not following standards are simply not used.
Coordination is vital.
Analysis Centers are going more and more to standards. There are annual workshops where models are discussed and then adopted. Gerhard Beutler said that the Analysis Coordinator motivated Analysis Centers to improve their products. New candidate results were included in combinations to show how their results would have affected the combined results. Even if 1 or 2 Analysis Centers are heavily weighted in the final products, no one is excluded.