OT: Looking for plotting program to replace gnuplot

[John Ackermann N8UR <jra@febo.com>]

Hi --

Sorry that this is slightly off-topic, but I thought someone here might be 
able to help.  I've been using gnuplot to format some fairly simple graphs, 
but its combination of totally obscure documentation and apparent output 
limitations are driving me up the wall.  (Today's example:  I want to plot 
some noisy data with a smoothing curve.  I finally figured out how to put 
both plots on the same screen, but there's apparently no way to tell the 
program to use different colors for the two lines, at least using the png 
output tool.)

Can anyone suggest a program that does what gnuplot does, but with a bit 
more polish?

Thanks,

John Ackermann
jra@febo.com