Command names on spectroscopy

The commands on spectroscopic data cover various domain in the database:

Spectral classification

The command mk
is used to query the MK spectral types
The command mks
is used to query the selected MK spectral types
The command spt
is used to query the spectral types in one dimension

Rotational velocity

The command vsn
is used to query the rotational velocities

Radial velocity

The command irv
is used to query the radial velocities
The command mrv
is used to query the mean radial velocities
The command gpo
is used to query the radial velocities obatined with an objective prism
The command rfs
is used to query the radial velocities obatined with a focal reducer

Orbit of spectroscopic binaries

The command orb
is used to query the elements of spectroscopic binaries

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