For each gene, the voxel data is a 67 × 41 × 58 (rows × columns × depth) array, giving an “energy” value representing the expression. In addition, for each voxel we know the anatomical annotation. The Allen Brain reference atlas is given at a finer resolution with voxels of 25μm (528 × 320 × 456). In order to achieve finer resolution and smoother images we used linear interpolation of the coarse (200μm) in situ data into the finer grid (25μm). For annotation we used the color code of the Allen reference atlas.
