Parameters
Required
 Sky position, galactic, supergalactic, or equatorial (J2000 as 360° decimal) in degrees.
Optional
 Cone (degrees) [default 10°]; plot data points within this cone angle.
 Distance (Mpc); returns model velocity in km/s.
 Velocity (km/s); returns model distance(s) in Mpc – potentially more than one value.
Features
 Model distance – velocity curve (blue) is derived from interpolation of velocities on a grid of distances with grid intervals of 6.25 Mpc. The value at each point is averaged over the 8 nearest grid points weighted by the inverse square of separation.
 Pause cursor over blue curve for distance and velocity information at chosen location.
 Pause cursor over data points for extra information.
Details
 Top panel: Observed velocity, V_{ls}, vs. distance. Bottom panel: Cosmologically adjusted velocity, V^{c}_{ls}, vs. distance.
The corrected velocity V^{c}_{ls} is related to the observed velocity V_{ls} by:

V_{ls}^c = f(z)V_{ls}
where
f(z) = 1+1/2(1q_0)z1/6(2q_03q_0^2)z^2
q_0 = 1/2(\Omega_m2\Omega_{\Lambda}) = 0.595
when\Omega_m=0.27 and \Omega_{\Lambda}=0.73 and z=V_{ls}/c.

 In both panels, symbols of differing sizes correspond to different masses of the associated elements: large brown circles if mass greater than 10^{14}M_{☉}, smaller red circles if mass is between 10^{13} and 10^{14}M_{☉}, and black plus signs if mass is below 10^{13}M_{☉}.
 PGC1 is the Principal Galaxies Catalog identification of the brightest member of the group contributing to the data point
 The H_{0}=75 dashed line is only for reference.
How to acknowledge this work
