3D Cylindrical Interpolation Coefficients and indices
type InterpolCoeffs3D
!+ 3D Cylindrical Interpolation Coefficients and indices
integer :: i = 0
!+ Index of R before `rout`
integer :: j = 0
!+ Index of Z before `zout`
integer :: k = 0
!+ Index of Phi before `phiout`
real(Float64) :: b111 = 0.d0
!+ Coefficient for z(i,j,k) term
real(Float64) :: b121 = 0.d0
!+ Coefficient for z(i,j+1,k) term
real(Float64) :: b112 = 0.d0
!+ Coefficient for z(i,j,k+1) term
real(Float64) :: b122 = 0.d0
!+ Coefficient for z(i,j+1,k+1) term
real(Float64) :: b211 = 0.d0
!+ Coefficient for z(i+1,j,k) term
real(Float64) :: b212 = 0.d0
!+ Coefficient for z(i+1,j,k+1) term
real(Float64) :: b221 = 0.d0
!+ Coefficient for z(i+1,j+1,k) term
real(Float64) :: b222 = 0.d0
!+ Coefficient for z(i+1,j+1,k+1) term
end type InterpolCoeffs3D