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A general expression for internal probable errors of radial velocity determinations is derived utilizing an idealized absorption line profile and a simplistic statistical approach. This method considers the role of dispersion, plate resolution, spectrum width, and intrinsic line width. Comparison with the published study of Abt and Smith indicates satisfactory agreement. Methods of optimizing results are then discussed.doi:10.1086/129214 fatcat:x3zej4wrfvhqrpfn5f7jcyyy3u