Metrical Symbols (Unicode)

Which Unicode characters should we use to encode Greek metrical symbols

 * Metrical symbols are encoded in Unicode in the Miscellaneous Technical region, 23D1-23D9 (see http://www.unicode.org/charts/PDF/U2300.pdf).
 * See also the TLG technical document on the proposal to encode Greek metical characters in Unicode, which can be found at http://repositories.cdlib.org/tlg/unicode/15/
 * Brill have released some advice on symbols for metrical display (http://www.brill.nl/downloads/Metrical-Characters-Unicode-updated.pdf)
 * This issue was discussed at some length on the Unicode discussion list (see e.g. http://lsv.uky.edu/scripts/wa.exe?A2=ind0110&L=unicode&D=1&O=D&P=235 or go to http://lsv.uky.edu/archives/unicode.html and search for "metrical" vel sim.).

What fonts support this character range?
Some fonts we have found to do so reliably (as per November 2006) are:


 * New Athena Unicode
 * Cardo

Others suggestions of suitable fonts are most welcome.