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And, of course,
od -An -tu1 tmpchars | tr -s ' \n' ' '
will do the job ...

Not sure I fully understand the request (or problem). Looking at the result of
hexdump -v -e '1/1 "%u "' tmpchars
59 108 107 97 70 59 76 75 74 49 50 51 52 82 197 . . .I get a similar one with
od...