The diagrams are correct.

Read the third item in the list of Variations in the Wikipedia article titled Helmholtz pitch notation. I chose to use this variation of Helmholtz pitch notation in my example Perl script because it seems more well-suited to computer use and digital typography. One thing that troubled me is that there are no Unicode characters that are low versions of the high prime characters:  PRIME U+2032 (′), DOUBLE PRIME U+2033 (″), TRIPLE PRIME U+2034 (‴), etc.

In reply to Re^5: utf8 hash keys revisited: How can i use musical symbols as hash keys? by Jim
in thread utf8 hash keys revisited: How can i use musical symbols as hash keys? by karlgoethebier

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