If you think that PP3 mispositioned a label you can change that
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:
(See The keyword `towards', for a figure visualising these
abbreviations. But be careful since this figure is actually intended
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.