I think I got it! (maybe)
The yellow bar at the top represents deviations from the sweep generator....the less spikes the better? The line with the anti-skip on has more spikes......that's bad. OK, anybody......
Heh, sorry Neruda. The top bar doesn't mean much, it's the waveform of the signal, but is packed so tightly you can't see anything useful. The bottom part is a spectograph. Bottom represents DC, top 24000 Hz. Left is the start of the recording, right is the end. It's basicly just a graphical representation of the frequency and loudness of a signal over time.
The blue noise in the background in the second one is the noise being caused by the anti-skip on the CDP. It's basicly white noise and not very loud, so it looks like a blue tint without any definate bands of color or detail. The changes in intensity as the main signal goes up must be a side effect of the compression the player uses.