coreutils 5.0: misalignment of `Used' with df -m

[Karl Berry]

Maybe this is brokenness in the POSIX spec, but it looks to me like the
`Used' heading should be shifted over three spaces or so with df -mP:

$ df -mP
Filesystem         1048576-blocks      Used Available Capacity Mounted on
/dev/hdb3                31497      6789     23109      23% /
/dev/hdb1                  485        41       419       9% /boot
/dev/hdb4                82977     22502     56260      29% /u
...

(This is coreutils on Linux, as you can tell :)

(I noticed this because I usually have alias df="df -P" so I always get
one line per filesystem...)

Thanks,
karl