X–N and X–X (1s² core) maps for cyanuric acid

X–N maps and X–X (1s² core) maps for cyanuric acid, C₃H₃N₃O₃, at 100 K are presented. The differences in scale and in the atomic parameters have large effects (≤ 0.4 e Å^-3) on the difference density at the nuclei but smaller effects (≤ 0.15 e Å^-3) on the bond density distributions. In particular, the density distribution around the O atoms, where polarization is likely to occur, is different in the two types of maps. It is concluded that, in these regions, the X-N maps yield the more reliable results.