Understanding Airport Extreme (square one) Logs and Statistics window

I am trying to figure out how to read the Wireless Clients window under the Logs and Statistics window.Nothing too technical. As an example I am reading this Airport and I see:

In the top window it reads:
Graph - yellow and green line. The yellow is at -60 dBm. The green reads -80 dBm
Does the yellow line represent the actual Airport?
Does the green line represent a  machine that is connected to the airport?
What is a good/ bad in this graph?

In the bottom box it reads:
 Clients                                           Signal   Noise     Rate     Type
yellow line - 00:1D:E0:85:B2:F1       -57      -96           54       802.11a
green line -  00:1F:3B:69:EC:F7      -76       -96           18     802.11b/g

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Both lines refer to machines that are connected to the Airport Extreme.  One is connected via 802.11a, and one is connected via 802.11b/g.  What's good is that you do have good signal strength to both clients and low noise numbers as well.  What could be bad is that the 802.11b/g client is only connected at 18mbps.  I say could be, because that number will fluctuate due to any number of factors such as bandwidth, distance, etc.

Anyway, here's an interesting article that you can read about measuring signal strength:

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