[system-traders] signal using Above

[Flatman <flatman AT swing.be>]

hi ,

if I add this line in a graphic generated with graphic.pl 

--add="BuySellArrows(Systems::Generic {Signals::Generic::Above{I:MACD 12 26 9} 0} {Signals::Generic::Below {I:MACD 12 26 9} 0} )"

the signal will appear on every singel day ...

What should it to make this signal appear only when MACD crosses 0 ?


Thanks
Erik