Wait'll we get off this front page.

(the country code for Thailand is 66)

A spectrogram is a graphic illustration of sound with time from left to right across the page 15 seconds in this case is represented and frequency from the bottom of the page to the top,

And you can see that the signature of a stream is represented here in the bottom third or half of the page, while birds that were once in that meadow are represented in the signature across the top.

You can see that the stream is still represented in the bottom third of the page, but notice what's missing in the top two thirds.