Module variables

n_hist -- integer

u -- real(dp), allocatable, dimension(:,:)

dF -- real(dp), allocatable, dimension(:,:)

last_F -- real(dp), allocatable, dimension(:)

last_n -- real(dp), allocatable, dimension(:)

dn_mm1 -- real(dp), allocatable, dimension(:)

a -- real(dp), allocatable, dimension(:,:)

beta -- real(dp), allocatable, dimension(:,:)

gamma -- real(dp), allocatable, dimension(:,:)

c -- real(dp), allocatable, dimension(:,:)

t -- real(dp), allocatable, dimension(:,:)

w -- real(dp), allocatable, dimension(:)

xmin, fmin, xmax, fmax, bracket_step, x3 -- real(dp)

f3, x4, f4 -- real(dp)

need_bracket, got_f3, got_f4 -- logical

do_mix_broyden interface