I do see your point. I'm casting about to find a good way to show this, especially when pulling results from separate data files, where the file names won't be a particularly good way to indicate a difference. Alternatives:

* The legend at the bottom "Local/Remote: localhost/flent-fremont.bufferbloat.net - Time: 2019... " could include "Pinging 1.2.3.4"
* Or perhaps "Local/Remote/Pinging: localhost/flent-fremont.bufferbloat.net/1.2.3.4 - Time: 2019... "
* Or in the case that Flent was combining separate data files, (actually, anytime the ping host is different from the -H host) perhaps the plot legend (on the right of the chart) could include the IP address of the alternate ping host - that is, "Ping to 1.2.3.4 (ms)" instead of "Ping (ms)" 

PS I'm not meaning to be glib, or trying to ignore other important situations. I expect this particular use case to be very common, and so want to make sure it looks great in the test results and charts. Thanks.

*I'm mostly adding the image to prompt my memory of how the chart looks, not for new information*
![image](https://user-images.githubusercontent.com/1094930/64439228-7e5a5880-d097-11e9-9068-1f80fd634be7.png)

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