#NHI =  13.582 0.006
aUV = -0.25 0.5
min k_C = -1.
max k_C = 1.
min k_N = -1.
max k_N = 1.
min k_Al = -1.
max k_Al = 1.
min k_Fe = -1.
max k_Fe = 1.
