Inter-instrument calibration using magnetic field data from Flux Gate Magnetometer (FGM) and Electron Drift Instrument (EDI) onboard Cluster - Nakamura,R; Plaschke,F; Teubenbacher,R; Giner,L; Baumjohann,W; Magnes,W; Steller,M; Torbert,RB; Vaith,H; Chutter,M; Fornacon,K-H; Glassmeier,K-H; et al. (GEOSCIENTIFIC INSTRUMENTATION METHODS AND DATA SYSTEMS, 2013)