Fig. (4) Three dimensional vortex structures for the JICF with and without block ((a). JICF without block at r=1; (b). JICF with block at r=1; (c). JICF without block at r=2; (d). JICF with block at r=2; (e). JICF without block at r=3; (f). JICF with block at r=3)