bitrate graph for vorbis 1.0

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Attachment #1: raw data file ("d1")
Attachment #2: graph from gnuplot ("bitrate.png")

The first song was "Being For the Benefit of Mr. Kite", by the Beatles,
from Sgt. Pepper.  The second was "Raining Blood", by Tori Amos, from
Strange Little Girls.  The third was "Slave to Love", by Lords of Acid,
from Farstucker.  The encoder used was a CVS snapshot from Friday
evening (2002-07-12), and the vendor string produced by Vorbis was
"Xiph.Org libVorbis I 20020711".

The gnuplot command I used was:

echo -e 'set title "Vorbis 1.0 Bitrates"\nset xlabel "quality"\nset ylabel =
"bitrate (kbps)"\nset data style lp\nset term png\nset output "bitrate.png"=
\nplot "d1" using 1:2 title "Mr. Kite", "d1" using 1:3 title "Raining Blood=
", "d1" using 1:4 title "Slave to Love"' | gnuplot

Here's some FAQ-style text which might be used to accompany the graph
(replacing the third paragraph of the #quality section):

  It's useful, however, to have a rough idea of how large a file you
  will get for a given quality setting.  Because Vorbis uses variable
  bit rates, the actual size (bit rate) of each file will vary depending
  on how difficult that file is to encode.  The following graph shows
  the resulting bit rates for three different songs at different quality
  settings.

--=20
Greg Wooledge                  |   "Truth belongs to everybody."
[email protected]              |    - The Red Hot Chili Peppers
http://wooledge.org/~greg/     |

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0	61.4	51.6	67.2
1	76.1	66.9	80.6
2	89.2	80.6	90.6
3	111.1	99.9	108.3
4	126.8	112.4	121.3
5	158.2	146.5	153.5
6	187.2	175.7	187.1
7	210.3	198.1	213.8
8	240.6	227.0	250.3
9	308.0	295.3	325.7
10	433.1	400.4	487.3

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