Hi Tom,

"...Why is [NGC 6281] shown so large?"

At the time, the NGC-IC database from Wolfgang Steinicke showed it as
having a diameter of 200 arcminutes. (The most recent version has changed
that to 8 arcminutes, and you might argue that that's too small.)

Unfortunately, there is no way (yet) to change this. (Nor the position
or magnitude of assorted objects.) Good news is that in the future, I'll
be using the current NGC-IC (and other datasets will be similarly updated).
That will fix almost all of the problems of this ilk; the last few versions
of Wolfgang's dataset have had very few fixes, reflecting the fact that
he's converging on a completely cleaned-up NGC and IC catalog.

-- Bill