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We present a fitting formula for the luminosity and angular diameterdistances in cosmological models with pressureless matter, a cosmologicalconstant and zero spatial curvature. The formula has a relative error of lessthan 0.4% for 0.2<\Omega_0<1 for any redshift, and a global relative error ofless than 4% for any choice of parameters.

Analytical Fit to the Luminosity Distance for Flat Cosmologies with a Cosmological Constant