x-axis	Teff	log g	[Fe/H]	[alpha/Fe]	[C/Fe]	[N/Fe]
Teff coded by chi^2
Teff coded by [Fe/H]
Teff coded by log g
Teff coded by S/N
log g coded by Teff
[Fe/H] coded by Teff
[Fe/H] coded by log g
[alpha/Fe] coded by Teff
[alpha/Fe] coded by log g