text: c-----Al and N mass (to be multiplied by umass)
        real(8),parameter:: am_Al = 26.9815d0 *umass
        real(8),parameter:: am_N  = 14.0067d0 *umass
  c-----RK potential parameters for AlN
        real(8),parameter:: rk_z(1:2)=
       &     (/ 1.d0,
       &       -1.d0 /)
  c-----energy-scale base
        real(8),parameter:: rk_eps= 0.01d0
  c-----length-scale base
        real(8),parameter:: rk_sgm= 4d0
  c-----2-body
        real(8),parameter:: rk_l1 = 0.25d0 *rk_sgm
        real(8),parameter:: rk_l2 = 2d0 *rk_sgm
  c-----3-body
        real(8),parameter:: rk_b  = 540d0 *rk_eps
        real(8),parameter:: rk_l3 = 0.5d0 *rk_sgm
        real(8),parameter:: rk_rc = 1d0 *rk_sgm
        real(8),parameter:: rk_c  = 30d0
  c-----num of division for 2-body term table
        integer,parameter:: nd2b = 2048
  