Creating a german kind of "psalm-note"

[Niklas Arnitz]

In germany we have certain notation called "rezitationston" or "psalmton".

It's noted like the following Picture:

(The >====< part)

Can I recreate this with gregorio?

[Patrick Williams]

You can place an equal sign = after the lower-case note letter to get what the documentation calls a linea, or the white/hollow variant by adding the letter r, but I don't know of a command to stretch it horizontally.  It's a useful style of notation, so please let us know if you figure out how to replicate it in gregorio.