strhelper_lan::get_background

Source: stream/helpers/lan/strhelper_lan__get_background.pro

 strhelper_lan::get_background
        Return the background levels for a lan rates stream.

 Usage:
        level=strid->get_background([time])

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

 History:
        Original: 24/11/99; SJT
        Moved to strhelper_lan class: 21/12/99; SJT
        Added time keyword: 15/2/00; SJT