diff --git a/src/regolith/regolith_streamtube_lineseg.f90 b/src/regolith/regolith_streamtube_lineseg.f90
index f2330065..f1070747 100644
--- a/src/regolith/regolith_streamtube_lineseg.f90
+++ b/src/regolith/regolith_streamtube_lineseg.f90
@@ -18,29 +18,25 @@
 !  Notes       :  
 !
 !**********************************************************************************************************************************
-subroutine regolith_streamtube_lineseg(user,surfi,thetast,ri,rip1,zmin,zmax,erad,eradi,deltar,newlayer,vmare,totseb)
+subroutine regolith_streamtube_lineseg(user,surfi,thetast,ri,rip1,zmin,zmax,erad,eradi,deltar,vseg,newlayer,rm)
    use module_globals 
    use module_regolith, EXCEPT_THIS_ONE => regolith_streamtube_lineseg
    implicit none
    ! arguemnts
    type(usertype),intent(in) :: user
    type(surftype),intent(in) :: surfi
-   real(DP),intent(in) :: thetast,ri,rip1,zmin,zmax,erad,eradi,deltar
+   real(DP),intent(in) :: thetast,ri,rip1,zmin,zmax,erad,eradi,deltar,vseg,rm
    type(regodatatype),intent(inout) :: newlayer
-   real(DP),intent(inout) :: vmare,totseb
+
    ! internal variables
    real(DP),parameter :: a = 0.936457 
    real(DP),parameter :: b = 1.12368
    type(regolisttype),pointer :: current
    real(DP) :: z,zstart,zend,rstart,rend,r
-   real(DP) :: vsgly,x
-
-   ! * Mixing
-   real(DP) :: zmix 
+   real(DP) :: vsgly
 
    current => surfi%regolayer
    z = current%regodata%thickness
-   zmix = z 
    zstart = 0.0_DP
    zend = z
  
@@ -58,10 +54,8 @@ subroutine regolith_streamtube_lineseg(user,surfi,thetast,ri,rip1,zmin,zmax,erad
 
        if (zend <= zmin) then
           if (zmax <= zend + current%next%regodata%thickness) then 
-             vsgly = newlayer%thickness * user%pix**2
-             vmare = vsgly * current%next%regodata%comp
-             totseb = vsgly 
-             !write(*,*) 'z<zmin',z,vmare/user%pix**2,vsgly/user%pix**2,ri,rip1,zmin,zmax,zstart,zend
+             newlayer%thickness = vseg
+             newlayer%comp      = vseg * current%next%regodata%comp
              exit
           else
              current => current%next
@@ -73,9 +67,9 @@ subroutine regolith_streamtube_lineseg(user,surfi,thetast,ri,rip1,zmin,zmax,erad
                rend = regolith_quadratic_func(zend,erad,ri,rip1,rstart)
                vsgly = 0.25_DP * PI * deltar**2 * a**2 * eradi / b * (abs(tan(b/eradi * rend) &
                        - tan(b/eradi * rstart)) - abs(b/eradi * rend - b/eradi * rstart))
-               vmare = vmare + vsgly * current%regodata%comp
-               totseb = totseb + vsgly
-               !write(*,*) 'lmid',z,current%comp,deltar,vsgly/user%pix**2,ri,rip1,rstart,rend,zmin,zmax,zstart,zend 
+               newlayer%thickness = newlayer%thickness + vsgly 
+               newlayer%comp      = newlayer%comp      + vsgly * current%regodata%comp
+
                current => current%next
                z = z + current%regodata%thickness
                r = rstart 
@@ -83,22 +77,14 @@ subroutine regolith_streamtube_lineseg(user,surfi,thetast,ri,rip1,zmin,zmax,erad
                zstart = zend 
                zend = z
        else if (zend >= zmax .and. zstart <= zmin) then
-               vsgly = newlayer%thickness * user%pix**2
-               vmare = vsgly * current%regodata%comp
-               totseb = vsgly
-               !write(*,*) 'z>zmax',z,vmare/user%pix**2,vsgly/user%pix**2,ri,rip1,zmin,zmax,zstart,zend
+               newlayer%thickness = vseg
+               newlayer%comp      = vseg * current%regodata%comp
                exit
        else if (zend >= zmax .and. zstart > zmin) then 
                 ! last part of a stream tube
-               vsgly = 0.25_DP * PI * deltar**2 * a**2 * eradi / b * (abs(tan(b/eradi * rip1) - tan(b/eradi * ri)) - & 
-                       abs(b/eradi * rip1 - b/eradi * ri))
-               vmare = vmare + (vsgly - totseb) * current%regodata%comp
-               totseb = vsgly 
-               !write(*,*) 'llast',z,current%comp,vmare/user%pix**2,vsgly/user%pix**2,ri,rip1,rstart,rend,zmin,zmax,zstart,zend
+               newlayer%comp      = newlayer%comp + (vseg - newlayer%thickness) * current%regodata%comp
+               newlayer%thickness = vseg
                exit
-       !else 
-       !        write(*,*) '??',ri,rip1,zmin,zmax,zstart,zend
-       !        exit
        end if
 
    end do