Hey wolf,

Great question!

When you're looking at the time graphs, each pixel in the graph can be comprised of 1 or more samples. If you're looking at a smaller time frame (like 5 minutes), each sample may be multiple pixels wide. If you're viewing a larger timeframe (48 hours, for example), it gets tough to represent each sample on it's own pixel (as there's a limited amount of space to work with). PingPlotter starts to average the latencies/packet loss when you zoom out to a larger timeframe to make an effort to get everything in view. We cover this concept in more detail here:

http://www.pingman.com/kb/20

The packet loss percentage scale is shown along the right side of the graph - and can be adjusted. We've got a section of our manual that goes into the details on this (under the "Packet loss" section):

http://www.pingplotter.com/manual/displayoptions.html

Hopefully this helps out! If you have any other questions - don't hesitate to ask.

-Gary