Spectroscopy data file 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.
A 2428890.9305 -16.8 1.8 A 2428918.6569 +54.2 4.4 A 2428918.6822 +53.6 1.9 A 2428924.7150 +36.6 2.2 A 2428934.5954 -23.9 2.2 A 2428934.6524 -22.8 1.8 A 2428934.6760 -18.3 1.9 A 2428934.7204 -10.8 2.4 A 2428934.7434 -15.7 2.3 B 2443416.912 +163.0 5.0 B 2443449.816 -136.0 5.0 B 2443449.824 -142.0 5.0 B 2443471.773 +194.0 5.0 B 2443475.751 -187.0 5.0 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 C 2435320.8 +2.0 1.0 C 2435386.9 +31.2 0.7 C 2435737.9 -18.3 0.7 C 2435801.1 -25.6 0.6 C 2436078.4 +33.6 0.6