track_rate_stream::get_background

Source: stream/rate/Track/track_rate_stream__get_background.pro

 track_rate_stream::get_background
        Return the background levels for a track rate stream (0.0).

 Usage:
        strref -> get_background([time])

 Argument:
        time    double  Array of times (JD) at which the background is
                        required. 

 History:
        Original: 15/2/00; SJT
        Added time argument: 15/2/00; SJT