Spot at 9 meters:

full angle = 7mm, half angle = 3.5mm or 2.5mm if using the middle

Spot at 16 meters:

full angle = 12mm, half angle = 5.5mm or 3mm if using the middle

That would give divergence of:

full angle = 0.71mRad

half angle = 0.28mRad (or 0.07mRad using middle)

All comments/advice welcomed.