quad1_long[grid_field(3)%r0(1)]= 0.0   !inner x
quad1_long[grid_field(4)%r0(2)]= 0.0   !inner x
quad1_long[grid_field(5)%r0(1)]= 0.0   !inner y
quad1_long[grid_field(6)%r0(2)]= 0.0   ! inner y
quad1_short[grid_field(3)%r0(1)]= 0.0 ! bottom x
quad1_short[grid_field(4)%r0(2)]= 0.0  !bottom x
quad1_short[grid_field(5)%r0(1)]= 0.0   !bottom y
quad1_short[grid_field(6)%r0(2)]= 0.0   !bottom y
quad2_long[grid_field(3)%r0(1)]= 0.0   ! outer x
quad2_long[grid_field(4)%r0(2)]= 0.0   !outer x
quad2_long[grid_field(5)%r0(1)]= 0.0    !outer y
quad2_long[grid_field(6)%r0(2)]= 0.0   !outer y
quad2_short[grid_field(3)%r0(1)]= 0.0   !top x
quad2_short[grid_field(4)%r0(2)]= 0.0   ! top x
quad2_short[grid_field(5)%r0(1)]= 0.0   ! top y
quad2_short[grid_field(6)%r0(2)]= 0.0   ! top y
quad3_long[grid_field(3)%r0(1)]= 0.0
quad3_long[grid_field(4)%r0(2)]= 0.0
quad3_long[grid_field(5)%r0(1)]= 0.0
quad3_long[grid_field(6)%r0(2)]= 0.0
quad3_short[grid_field(3)%r0(1)]= 0.0
quad3_short[grid_field(4)%r0(2)]= 0.0
quad3_short[grid_field(5)%r0(1)]= 0.0
quad3_short[grid_field(6)%r0(2)]= 0.0
quad4_long[grid_field(3)%r0(1)]= 0.0
quad4_long[grid_field(4)%r0(2)]= 0.0
quad4_long[grid_field(5)%r0(1)]= 0.0
quad4_long[grid_field(6)%r0(2)]= 0.0
quad4_short[grid_field(3)%r0(1)]= 0.0
quad4_short[grid_field(4)%r0(2)]= 0.0
quad4_short[grid_field(5)%r0(1)]= 0.0
quad4_short[grid_field(6)%r0(2)]= 0.0