DATASET NAME: HACC DATASET OWNER’S NAME AND CONTACT: Argonne HACC team (EXASKY project) This data set was created using resources of the Argonne Leadership Computing Facility, which is a DOE Office of Science User Facility supported under Contract DE-AC02-06CH11357 ARRAY DIMENSION: 1D number of elements: 280953867 DATA NATURE: DECIMAL PHYSICAL DESCRIPTION OF THE DATASET: N-body simulation of particles (cosmological simulation) based on Hardware/Hybrid Accelerated Cosmology Code (HACC). This dataset is one snapshot (3D space) of HACC simulation, which contains six single-precision floating-point fields, namely, x, y, z, vx, vy, vz. The first three indicate coordinate information of particles, and the other three indicate particle's velocity along the three dimensions. The six fields are stored in separate 1D floating-point arrays. ENDIAN FORMAT (LITTLE or BIG): Little-endian PRECISION (DOUBLE or SINGLE): single-precision