Recent advances in x-ray spray diagnostics at Argonne National Laboratorys Advanced Photon Source have enabled absorption measurements of individual spray events.A focused x-ray beam(5x6 μm)enables collection of data along a single line of sight in the flow field and these measurements have allowed the calculation of quantitative,shot-to-shot statistics for the projected mass of fuel sprays.Raster scanning though the spray generates a two-dimensional field of data,which is a path integrated representation of a three-dimensional flow.The shot-to-shot variation over repeated spray is evaluated in terms of the standard deviation in mass-based units.A two-dimensional map of the standard deviation as a function of time reveals the position and time dependence of the fluctuating field.Variations in the standard deviation are explored across variations in nozzle diameter,injection pressure,and ambient pressure.