The range of heights for the job are divided into 7 bands.
For each of the bands a colour is allocated and the contours will be coloured in the colour
for the height range into which they fall.
Thus in the sample job, the 95-97 metre height range is coloured Brown, the contour
for 95, 96 and 97 heights will be assigned this colour.
Number Of Colours
Choose the number of colours used.
Specify the height range for each colour. This cannot be changed