Kinematic Distances Information
Kinematic Distance (kpc): 1.7
Allowed Range (kpc): 0.75 to 2.8
  Kinematic Distance 2 (kpc): 8.9
  Allowed Range (kpc): 7.8 to 9.9
Inferred Shell Size
  Shell Diameter (pc): 220
  Allowed Range (pc): 98 to 370
  Shell Diameter 2 (pc): 1200
  Allowed Range (pc): 1000 to 1300
Distance Notes:
Greater distance more likely based on Galactic spiral structure in direction of shell
Inferred shell size plausible in context of extent of Galactic Plane
Expansion Velocity Information
Velocity of Front Wall Vf (km/s): 10
Velocity of Back Wall Vb (km/s): 50
Expansion Velocity (km/s): 20
Based on raw (not normalized) spectrum.
Back wall estimate may be possibly
unrelated gas, or suffer from data quality issues.
Minimum 'Shell-like' velocity V1 (km/s): 17
Maximum 'Shell-like' velocity V2 (km/s): 39
Lower Limit on Vexp (km/s): 15
(from Vf and V2)