Summary: A simulated data set of backscattered waves, governed by the 2D wave equation, from randomly placed Dirichlet particles. The particles are circular with 0.2 < radius  < 2.0 and 1% < volume fraction < 20%. The incident wave is of the form ei k (x - xR -  t)  where the particles are placed in the halfspace x>0 and the backscattering is emitted and received at (xR, 0) with xR = -10.0. The data named bunny and bunnytest is for incident waves with 0 < k < 1 (where the term e- i k t factors out). The data named train and test is for incident waves of the form e0.1(x - xR - t)^2, with  9.5 < t < 98.        Format: An example of how to use the data is given  in [4]. To load the data requires the packages [1] and [2] in the language Julia v0.5> [3]. When using load(filename) the data will automatically be loaded as an array of type FrequencySimulation or of type TimeSimulation.  [1] https://github.com/jondea/MultipleScattering.jl [2] https://github.com/JuliaIO/JLD.jl  [3] https://julialang.org/ [4] https://github.com/gowerrobert/MultipleScatteringLearnMoments/tree/master/examples