A 'good' signal is simply one that met the basic criteria in your settings. It does NOT mean the server will regard it as Good. It does NOT mean it was sent, because it may have failed some 'server' sent paradigm to your specific controller... that you never know is there. It could also have had send attempted while the server was talking to your controller, instead of the other way areound,. Remember, this is a NETWORK... not single stations... other stations catch what is missed by your stations, or not sent by your station. A failure to send could even be a momentary GPS timing error likely aren't aware of! Lotsa reasons.
The graph is a "total' approximation... lower blue means lower quantity.
Greg gave you the correct information on the display annotations... don't put too much emphasis on the graph Tobi puts there for quick reference... that's all it is... a quick look-see...
When I get time, I'll get all the new Americas (region 3) stations added to the displays on "Sferics' so that you can watch your samples, check your 'zero crossings' etc...
Just been busy with other stuff...