Figure 3

Screenshot of ColorBrewer online tool. Screenshot of ColorBrewer online tool http://www.colorbrewer.org/ showing the colour scheme we have chosen for our maps. This yellow-green-blue quadri-colour scheme is colour blind friendly, black and white photocopy friendly (for printed output), LCD projector friendly, laptop (LCD) friendly, CRT screen friendly, and colour printing friendly–all at the same time. The corresponding Hue-Saturation-Value numerical triplets for the four colours in our scheme are also shown, ready for using in ArcView 3.x.