Construction, Measurement, Shimming, and Performance of the NIST-4 Magnet System. - Frank Seifert 004; Alireza R. Panna; Shisong Li; Bing Han 013; Leon S. Chao; Austin Cao; Darine Haddad; Heeju Choi; Lori Haley; Stephan Schlamminger (IEEE Trans. Instrum. Meas., 2014)