Fig. 4From: NOAA/NCEI and University of Colorado candidate models for IGRF-13Secular variation at Guam observatory (GUA, \(13.59^{\circ }\) latitude, \(144.87^{\circ }\) longitude). Observatory annual differences from definitive (D) and quasi-definitive (QD) data. Model predictions from CU/NCEI SV candidate models to IGRF13 and IGRF12. Model predictions from IGRF10, IGRF11, IGRF12, IGRF13 SV models, and from the most recent DGRF (IGRF13)Back to article page