the elevations of grid points for an area as follows: 1 2 3 4 5 6 7 8
F 690 709 726 732 735 740 743 747
E 696 715 729 736 740 737 739 740
D 702 723 733 742 737 737 745 747
C 707 726 732 732 729 740 740 730
B 709 725 723 722 730 738 731 727
A 711 721 715 715 732 730 719 722
The elevation are in meter. The reading are taken at 15m interval. Plot a 5m interval contour lines for the area. Use a scale 1:200