A data frame with 323 observations on the following 5 variables.
- east.west
the east-west coordinate. The origin, (0,0), is
near the center of the galaxy, east is negative, west is
positive.
- north.south
the north-south coordinate. The origin, (0,0), is
near the center of the galaxy, south is negative, north is
positive.
- angle
degrees of counter-clockwise rotation from the horizon-
tal of the slot within which the observation lies.
- radial.position
signed distance from origin; negative if
east-west coordinate is negative.
- velocity
radial velocity measured in km/sec.