Is it possible to draw a trend line for each line that's plotted on a line graph. In the attached example, I'd like to see the trend of yellows and the trend of reds. I'd like to be able to configure the line so that it isn't quite so heavy (dotted or dashed line, perhaps) or that it's coloured the same as the plotted line. I'm assuming that it's not possible, but I'd just like to confirm.