vertically aligning text/marks/tempo

[Urs Liska]

Somehow I feel this is a dumb question, but I didn't manage to find the
relevant info in the manual.

In the attached file you can see that each text element above the staff
is aligned individually, but I want to have them on a single baseline.

Putting the texts in a separate variable and Dynamics context improves
the situation but the texts are still not aligned against each other.
The same is true when trying \tempo or \mark. Overriding #'padding or
#'outside-staff-padding doesn't have any useful effect either.

So how can I force consecutive text elements to align vertically on a
single baseline?

Thanks
Urs

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