If you think that PP3 mispositioned a label you can change that
with `reposition':
reposition M 39 S ;
This puts the label for the nebula M39 below the nebula.
`S' means `south'. The following table shows all possible
values, however you know it by and large from the windrose probably:
E
NE
N
NW
W
SW
S
SE
(See The keyword `towards', for a figure visualising these
abbreviations. But be careful since this figure is actually intended
for the towards keyword.)
Using `reposition' is also necessary if PP3 has suppressed
a label because it hadn't found a good place for it.
`reposition' forces a label to be printed.