Source: stream/dyn_spect/Lan/lan_dyn_spect_stream__get_background.pro
lan_dyn_spect_stream::get_background Return the background levels for a dyn_spect stream. Usage: bg = strref -> get_background([time]) Argument: time double The time(s) for which the backgrounds are needed. History: Original: 20/3/00; SJT