Atmosphere Loss In Planet-Planet Collisions:

All collisions here are against a target of 6.25 Earth Masses in total, with atmospheres of 1.25 Earth Masses.

Projectile Mass = 0.25 Earth Masses, Impact Velocity = 20km/s

Projectile Mass = 2 Earth Masses, Impact Velocity = 30km/s

Projectile Mass = 4 Earth Masses, Impact Velocity = 50km/s

Projectile Mass = 5 Earth Masses, Impact Velocity = 60km/s