Spectroscopy data files have the extension *.vel*. The following gives
an example for Algol, where the columns are the component designation,
the Julian date of observation, and value and error of the radial velocity
(in km/s) measured. Optionally, plot symbol and color can be added to
each record. Available symbols are (0), x (1), * (2), triangle up (3),
triangle down (4), square (5), diamond (6), pentagon (7), star (8) and
circle (9). These are open symbol, unless 10 is added to the symbol number.
The available colors are black (0), white (1), red (2), green (3), blue (4),
and more. **New feature: composite component designations, e.g. AB, are
allowed and the model prediction for such components will be computed from
their center of mass velocity.**

A 2428890.9305 -16.8 1.8 A 2428918.6569 +54.2 4.4 B 2443477.748 +145.0 5.0 B 2443478.743 -199.0 5.0 B 2443497.646 +179.0 5.0 B 2443498.673 -169.0 5.0 B 2443501.689 -201.0 5.0 C 2422984.4 -10.5 1.6 C 2425125.5 +5.9 0.6