Table 7. Average X···Y Contact Enrichment Ratios between the Different Chemical Types in the Eight Nonhydrated NxxCl Crystal Structures^a.

chem.	C	HC	Cl	N	HN	O
<surface> %	35.5	37.6	13.8	5.2	2.9	5.1
C	1.2(5)	1.0(4)	0.9(3)	1.0(6)	0.8(7)	0.6(3)
HC		0.7(3)	1.6(3)	1.2(4)	0.7(4)	1.6(6)
Cl			0.6(7)	0.1(2)	0.0(1)	0.4(4)
N				0.9(11)	4.3(55)	0.1(2)
HN					0.01(4)	4.5(69)
O						0.1(3)

^aThe sample standard deviations are given between parentheses. The over-represented contacts are highlighted in bold characters. The second line shows the average chemical content on the Hirshfeld surface. The hydrophobic atoms C, H_C, and Cl have been regrouped in the table. H_C and H_N refer to hydrogen atoms bound to carbon or nitrogen that are distinguished as they are chemically very different.