Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| interval name | size (steps) | size (cents) | just ratio | just (cents) | error | audio |
| --- | --- | --- | --- | --- | --- | --- |
| perfect fifth | 9.0 | 720.0 | 3:2 | 701.96 | +18.04 | Play Category:Articles with hAudio microformats |
| septimal tritone | 7.0 | 560.0 | 7:5 | 582.51 | −22.51 | Play Category:Articles with hAudio microformats |
| 11:8 wide fourth | 7.0 | 560.0 | 11:8 | 551.32 | +8.68 | Play Category:Articles with hAudio microformats |
| 15:11 wide fourth | 7.0 | 560.0 | 15:11 | 536.95 | +23.05 | Play Category:Articles with hAudio microformats |
| perfect fourth | 6.0 | 480.0 | 4:3 | 498.04 | −18.04 | Play Category:Articles with hAudio microformats |
| septimal major third | 5.0 | 400.0 | 9:7 | 435.08 | −35.08 | Play Category:Articles with hAudio microformats |
| undecimal major third | 5.0 | 400.0 | 14:11 | 417.51 | −17.51 | Play Category:Articles with hAudio microformats |
| major third | 5.0 | 400.0 | 5:4 | 386.31 | +13.69 | Play Category:Articles with hAudio microformats |
| minor third | 4.0 | 320.0 | 6:5 | 315.64 | +4.36 | Play Category:Articles with hAudio microformats |
| septimal minor third | 3.0 | 240.0 | 7:6 | 266.87 | −26.87 | Play Category:Articles with hAudio microformats |
| septimal whole tone | 3.0 | 240.0 | 8:7 | 231.17 | +8.83 | Play Category:Articles with hAudio microformats |
| major tone | 3.0 | 240.0 | 9:8 | 203.91 | +36.09 | Play Category:Articles with hAudio microformats |
| minor tone | 2.0 | 160.0 | 10:9 | 182.4 | −22.40 | Play Category:Articles with hAudio microformats |
| greater undecimal neutral second | 2.0 | 160.0 | 11:10 | 165.0 | −5.00 | Play Category:Articles with hAudio microformats |
| lesser undecimal neutral second | 2.0 | 160.0 | 12:11 | 150.63 | +9.36 | Play Category:Articles with hAudio microformats |
| just diatonic semitone | 1.0 | 80.0 | 16:15 | 111.73 | −31.73 | Play Category:Articles with hAudio microformats |
| septimal chromatic semitone | 1.0 | 80.0 | 21:20 | 84.46 | −4.47 | Play Category:Articles with hAudio microformats |
| just chromatic semitone | 1.0 | 80.0 | 25:24 | 70.67 | +9.33 | Play Category:Articles with hAudio microformats |
Question:
what is the value of the audio with a just ratio 21:20
Answer:
Play Category:Articles with hAudio microformats