This media file needs to be cleaned up, because: Sans-seriff fonts are preferred for diagrams (Rebuttal from creator: I and l, and Φ and ϕ are harder to distinguish in sans-serif).
For help, see Commons:Media for cleanup.

In other languages
বাংলা ∙ čeština ∙ dansk ∙ Deutsch ∙ English ∙ español ∙ euskara ∙ français ∙ magyar ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ മലയാളം ∙ Bahasa Melayu ∙ Nederlands ∙ norsk ∙ polski ∙ português ∙ română ∙ русский ∙ svenska ∙ 中文 ∙ 中文（简体） ∙ 中文（繁體） ∙ +/−