From data above we find the dominant angel at NE quadrant is 39 – 42 degree, and at NW quadrant is 333 – 336 degree. 39 – 42 and 333 – 336 area form angel 60o, to determine the main force we have to find the center of 39 – 42 and 333 – 336 area, it will be 7o (see Figure 7). So the main force come from N7o E and N97o E. There are two main force that have opposite direction. | From data above we find the dominant angel at NE quadrant is 39 – 42 degree, and at NW quadrant is 333 – 336 degree. 39 – 42 and 333 – 336 area form angel 60o, to determine the main force we have to find the center of 39 – 42 and 333 – 336 area, it will be 7o (see Figure 7). So the main force come from N7o E and N97o E. There are two main force that have opposite direction. |