mag_rate_stream::get_idf_info

Source: stream/rate/Mag/mag_rate_stream__get_idf_info.pro

 mag_rate_stream::get_idf_info
        Return idf information for a mag stream

 Usage:
        val = strref -> get_idf_info(<key>)

 Keywords:
        sectors         If set return the number of sectors (always 1)
        unit            If set, return the unit of the stream (nT or degrees)

 History:
        Original: 7/7/00; SJT
        Added _extra key to swallow unused items: 24/7/01; SJT