one_dim_1_1000.zip  one_dim_1001_5999.zip  mult_dimensional_grids.zip 
The compressed folder one_dim_1_1000.zip contains optimal quantization grids of the standard univariate normal distribution of size to , and one_dim_1001_5999.zip from the grids of size to .
The compressed folder mult_dimensional_grids.zip contains optimized quantization grids of the standard multivariate normal distribution of size between and and dimension between and . (It does not contain the onedimensional grids which are available separately.)
The files are in text format. In every case, the filename is N_d_nopti where N is the quantizer size and d is the dimension.
For a given size , the text files are organized as follows. It presents in the form of a matrix with rows and columns.
 On row : element of the grid and its companion parameters.

On last row :

In particular we can verify that

The multidimensional grids were obtained by an incremental "splitting" method based on an optimization by a mixed LloydCLVQ algorithm. The splitting method consists in appending to an optimized grid of elements random points to get the starting point for the optimization procedure for a quantizer of size .
Note that the CLVQ procedure is only used for small values of .
 The onedimensional grids where obtained by deterministic methods. This is to directly minimize the quadratic distortion seen as a function of values. Several methods are available as a tridiagonal NewtonRaphson method or a semiclosed Lloyd's algorithm. See article [1] for more details on these algorithms.
References
 Gilles Pagès, and Jacques Printems, "Optimal quadratic quantization for numerics: the Gaussian case", Monte Carlo Methods and Applications, vol. 9, pp. 135–166, 2003.