Notes: Good ground swells (long period swells) have strong colour away from the middle, chop is energy towards the middle (short period).
A stripy curve of the same period energy is preferable to a blotch or a range of periods.
Spring surf
![](http://4.bp.blogspot.com/-EF6fpZFaAkc/VeP7an34X6I/AAAAAAAAZY8/1hDTDN7tWrk/s320/ds502831.jpg)
This is the green shading to the top of the graph.
Autumn surf
![](https://4.bp.blogspot.com/-N_1RO-2bJx0/VvH5Z4bzrcI/AAAAAAAAbrY/HRbhhPM6TDYSX9EWq_Z8KQV_DJqXfvEcg/s320/SYDirspecAutumn.png)
Note the difference in the green shading to the Spring graphic above and the different strengths of the various periods.
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