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In this investigation, cone angles of high pressure diesel sprays emerging through plain orifices were studied. The study was conducted at constant fuel pressures by using injection system in a single pulse mode. The results show cone angles to depend on orifice dimensions, background gas density as well as on injection pressure. Droplet sizes in the mixing region of the spray were also measured at a background gas density of one atmosphere. Sauter mean diameter was found to depend on orifice diameter and injection pressure. Based on the experimental results, a correlation is derived to predict mean diameter in the mixing region.