Linear Interpolation Coefficients and indices
type InterpolCoeffs1D
!+ Linear Interpolation Coefficients and indices
integer :: i = 0
!+ Index of position right before `xout`
real(Float64) :: b1 = 0.d0
!+ Coefficient for y(i) term
real(Float64) :: b2 = 0.d0
!+ Coefficient for y(i+1) term
end type InterpolCoeffs1D