They found that both approaches yielded qualitative agreement with previously published experimental data. (sciencedaily.com)
[4] Figure 1 shows qualitative agreement between all of these SPCZ indicators. (en.wikipedia.org)
The three precipitation datasets are indeed in reasonable agreement over the polar stereographic domains, but less consistent over the tropical regions of Africa and South America identified previously, even though there is a fair degree of qualitative agreement between ERA - Interim and JRA - 55 for anomalies in oceanic precipitation in the tropics. (climate.copernicus.eu)