Longa with long stem

[Reuben Thomas]

I had a look through the manual, but I can't seem to find a \longa with a
longer tail, such as I have often seen. Also, one whose tail follows the
usual rules (i.e. on the bottom line, I'd expect the tail to go up; or is
that wrong? I'm copying from a handwritten score, so it might be at
fault...).

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http://www.mupsych.org/~rrt/ | certain, a.  insufficiently analysed