TST: ensure exception raised when referencing species indices > (n-1)
TST: ensure exception raised when referencing species indices > (n-1)

bjodah/chemreac,bjodah/chemreac,chemreac/chemreac,chemreac/chemreac,bjodah/chemreac,bjodah/chemreac,chemreac/chemreac,chemreac/chemreac