Fig. 5.
From: Testing IGRF-11 candidate models against CHAMP data and quasi-definitive observatory data
Map of the 87 observatories used for test (1) only (red cross), test (2) only (black dots) or both tests (red stars): AAA, AAE, AIA, AMS, ASC, ASP, BDV, BEL, BFE, BFO, BLC, BMT, BOU, BOX, BRW, BSL, CBB, CLF, CMO, CNB, CTA, CZT, DOU, DRV, EBR, ESK, EYR, FCC, FRD, FRN, FUR, GCK, GNA, GUA, GUI, HAD, HBK, HER, HLP, HON, HRB, HRN, HUA, IQA, IRT, IZN, KAK, KDU, KNY, KOU, LER, LRM, LVV, LZH, MAB, MAW, MBO, MCQ, MEA, MMB, NAQ, NCK, NEW, NGK, NUR, NVS, PAF, PHU, PPT, PST, RES, SBA, SHU, SIT, SJG, SOD, SPT, STJ, TAM, THL, THY, TRW, TUC, UPS, VAL, VIC, VSS (see www.intermagnet.org for full names and positions).