  We have measured the transmission of the Lyman alpha forest produced by
neutral hydrogen scattering in the intergalactic medium between redshifts 2 and
6.3 using high signal to noise, high resolution (R > 5000) observations of 50
quasars spread over the redshift range. We use a uniform set of 15 Angstrom
intervals covering Lyman alpha, Lyman beta, and Lyman gamma absorption regions
to tabulate the forest transmission as a function of redshift. The transmitted
fractions show a relatively smooth evolution over the entire range of
redshifts, which can be modelled with a smoothly decreasing ionization rate.
Previous claims of an abrupt change at a redshift of approximately 6 appear in
part to be a consequence of an incorrect conversion of Lyman beta to Lyman
alpha optical depths. The tabulated transmissions can be used to calculate the
colors of objects with a specified input spectrum as a function of redshift. We
calculate the colors of a flat f_nu galaxy with a large intrinsic continuum
break, as an important example.
