Fig. 13From: Improvements and validation of the IRI UP method under moderate, strong, and severe geomagnetic stormsPercentage of IG12eff variogram models declared winners by the NQCR procedure. a Winning percentages related to each IG12eff variogram model, for each single storm, after applying the NQCR procedure sketched in Fig. 6; b same as a but considering all storms listed in Table 3 as a wholeBack to article page