This page describes the format of the Swiss Cheese file, which is required for the creation of the SwissCheeseX Energy object. This is an unformatted (binary) file. It is endian-specific, but the utilities on any platform can read either a big or little endian file. Identifiers The file begins with a specific number, DENSITYOPEN, defined in Yup.Data.Constants and ends with a specific number, DENSITYEXIT, also defined in Yup.Data.Constants. Format The contents of this file are: Data C Type Opening Identifier = DENSITYOPEN int S = number of Holes int Width of cubical voxel [Å] double L = number of voxels along the first dimension int M = number of voxels along the second dimension int N = number of voxels along the third dimension int dL = index offset along the first dimension int dM = index offset along the second dimension int dN = index offset along the third dimension int first hole O double hash of location indices int ...n-th hole O double hash of location indices int last (S-th) hole O double hash of location indices int Closing Identifier = DENSITYEXIT int Note that this file contains data for voxels with densities above a user-defined level. The data for each hole consists of a pair of numbers: the constant O and a hash of the location indices. The last is a single integer formed from the indices along the three dimensjons (i, j, k) yields a hash value of L [ Mk + j ] + i. Utilities The SwissCheese module in Yup.Tools provide functions to convert density maps to Swiss Cheese files.