Source: stream/rate/Mfsa/mfsa_rate_stream__get_background.pro
mfsa_rate_stream::get_background Return the background levels for a mfsa rate stream (0.0). Usage: strref -> get_background([time]) Argument: time double Array of times (JD) at which the background is required. History: Original (after track): 3/4/01; SJT