File talk:Kurve gleicher lautstärke.svg
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x-axis
[edit]The x-axis (showing the frequency) is not labelled. --93.241.205.225 04:49, 5 December 2018 (UTC)
The x-axis (showing the frequency) is not labelled. --93.241.205.225 04:49, 5 December 2018 (UTC)[reply]