2.25.80 \override Score.BarNumber.self-alignment-X at end of previous bar

[Paul Scott]

From NR 2.5.3 Aligning bar numbers, I don't understand: 
\overrideScore.BarNumber.self-alignment-X=
#(break-alignment-listCENTERRIGHTCENTER) How can I get all bar numbers at the end of the previous bar? I don'tknow how to extract a graphic file from copyrighted material to attach 
an example. i.e. slightly left of the beginning of the relevant bar. 
Thank you for any help with this, Paul