spect_stream::get_background

Source: stream/spect/spect_stream__get_background.pro

 spect_stream::get_background
        Return the background levels for a spect stream.

 Usage:
        bg = strref -> get_background([time])

 Argument:
        time    double  The time(s) for which the backgrounds are
                        needed.

 Notes:
        This is a dummy, subclasses that support backgrounds should
        provide a specific method.

 History:
        Original: 20/3/00; SJT