Passages labelled according to Sa

The squares are divided according to how many passages ther are through them. For a given number of passages, the passages are grouped into 3 mean Sa-value groups. Mean Sa larger than 10 are coloured red, from 2 to 9 blue and 1 or 0 are coloured black. These groups are arranged in a matrix with as many rows as there are passages and the division on Sa in columns in no particular order.

Number of passages 1

Number of passages 2

Number of passages 3

Number of passages 4

Number of passages 5

Number of passages 6

Number of passages 8

Created with Wolfram Mathematica 9.0