Information on top line orientation used in Greek Papyri

In Bingen's email response to my query [dated 24 July 2002] he says:
"Letters hanging on the virtual upper alignment is banal for the 3d
century B.C.; you find it even in inscriptions."

In Biblical MSS:
1. most notably PRyl 458 [#957] of Deut (2nd bce)
2. Perhaps also 4QLXXLev\a, 7QLXXEpJer, POxy 4443 of Esther (1st/2nd ce)

In Possibly Jewish Documentary Materials:
1. Toubias to Apollonios (P.Edgar 13 and 84 = CPJ 4-5), 257 bce: "written
in large, regular uncials, with spaces between the sentences and also
between the numerals and the adjacent words." [see sep file, image]