PROCEDURE: iug_load_gmag_nipr_induction to load NIPR induction magnetometer data KEYWORDS: site = Observatory name, example, iug_load_gmag_nipr_induction, site='syo', the default is 'all', i.e., load all available stations. This can be an array of strings, e.g., ['syo', 'hus'] or a single string delimited by spaces, e.g., 'syo hus'. Available sites: syo hus tjo aed isa /downloadonly, if set, then only download the data, do not load it into variables. /no_server, use only files which are online locally. /no_download, use only files which are online locally. (Identical to no_server keyword.) trange = (Optional) Time range of interest (2 element array). frequency_dependent = get frequecy-dependent sensitivity (frequency [Hz] and sensitivity (H,D,Z) [Vp-p]) EXAMPLE: iug_load_gmag_nipr_induction, site='syo', $ trange=['2008-02-28/00:00:00','2008-02-28/02:00:00'] Written by: Y. Miyashita, Jan 23, 2011 ERG-Science Center, STEL, Nagoya Univ. erg-sc-core at st4a.stelab.nagoya-u.ac.jp Revised for NIPR data by Y. Sato, August 6, 2012 (sato.yuka at nipr.ac.jp)