What does RTTY look like?

I recorded some in Audacity. Here you can see the spectrum display. It wheedles back and forth between two tones which are clearly visible. You can also see some considerable fading in the signal. Them’s the breaks of propagation.  If you look really closely, you can see another, weaker signal in the spectrum directly below it which fades out entirely as the band conditions change.

RTTY viewed as a spectrum in Audacity