X0	connectivity index chi-0
X1	connectivity index chi-1 (Randic connectivity index)
X2	connectivity index chi-2
X3	connectivity index chi-3
X4	connectivity index chi-4
X5	connectivity index chi-5
X0A	average connectivity index chi-0
X1A	average connectivity index chi-1
X2A	average connectivity index chi-2
X3A	average connectivity index chi-3
X4A	average connectivity index chi-4
X5A	average connectivity index chi-5
X0v	valence connectivity index chi-0
X1v	valence connectivity index chi-1
X2v	valence connectivity index chi-2
X3v	valence connectivity index chi-3
X4v	valence connectivity index chi-4
X5v	valence connectivity index chi-5
X0Av	average valence connectivity index chi-0
X1Av	average valence connectivity index chi-1
X2Av	average valence connectivity index chi-2
X3Av	average valence connectivity index chi-3
X4Av	average valence connectivity index chi-4
X5Av	average valence connectivity index chi-5
X0sol	solvation connectivity index chi-0
X1sol	solvation connectivity index chi-1
X2sol	solvation connectivity index chi-2
X3sol	solvation connectivity index chi-3
X4sol	solvation connectivity index chi-4
X5sol	solvation connectivity index chi-5
XMOD	modified Randic connectivity index
RDCHI	reciprocal distance Randic-type index
RDSQ	reciprocal distance squared Randic-type index