invert graph

[nyx]

anyone know how to invert axis for sources in cacti?... I need to stack inbound on one axis and outbound on the other. kinda like ... http://oss.oetiker.ch/rrdtool/btdmd8.png

Also, is there anyway I can put 2 hard lines into the graph? I would like to put a line on the graph at certain data rates inbound and outbound, it will be a static line, like a "high tide" water mark

Thanks.

[BSOD2600]

Used the CDEF for each graph item which makes the value negative.