1.Make sure you have created a NEW THEME layer as per subsection CREATING A THEME.
2. Click the STYLING tab.
3. Click the IMAGES AND ICONS tab.
4. Select one of the provided symbols by clicking CHAR.
5. Click the THEMATICS tab.
6. Click the IMAGESIZES tab.
7. Select the field you would like to theme.
8. Click AUTOSET. (This gives you the lowest and highest values in your field range.)
(You can change these if required and type in your own minimum and maximum values.)
9. Adjust SCALE FROM and SCALE TO as required - this adjusts the size of the points.
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