[system-traders] graphic.pl question

[Kevin Kim <kykimnyc AT mac.com>]

So my graphic.pl conf file looks like this:

#
# conf.graphic - configuration file for graphic.pl
#
# price chart
--title=conf1
--type=barchart

# space
--add=New-Zone(25)

# MACD chart
--add=New-Zone(100)
--add=Set-Scale(-5,5)
--add=set-title(MACD,tiny)
--add=Curve(Indicators::MACD)
--add=Histogram(Indicators::MACD)


I want the MACD portion to graph the Fast Line and the Signal Line (look at http://clearstation.etrade.com/ for an example).
Obviously I need to change my conf file, but I am unsure how.
Do I need to extend GT?  Can anyone offer any advice?


-kevin