Thanks Nick › Forums › Spectroscopy › Nova in M31 › Thanks Nick 30 November 2018 at 10:00 pm #580305 George CareyParticipant I have the centroid at radius 3. These are values I get when I change the radius: centroid magn. radius 1 18.0 2 16.9 3 16.5 4 16.5 5 16.4 6 16.3 7 16.2 8 16.2 At radius 3 it looks like all of the nova is in the circle. I am never sure what is best.
