I want to see how bigwig tracks look, but I'm not sure I'm doing things properly. When I look at them in WashU with default properties I see the following:

This shows the reads per region. The maximum of 1 in the YY axis is given because it is showing the mean of all the reads (I assume), and no smoothing is used. The Aggregate Method = Mean.

However, this is cumbersome and not very easy to see what is happening in those regions. A summed coverage would be more interesting. When I select instead Aggregate Method = Sum, things start to become a big clearer. I have also considered 1 pixel smoothing:

Now my questions are:
- What is the "mean", "sum", etc. computed over? I cannot find the information of how many bins are being used when I right click any of the tracks.
- Prior to uploading them, I could of course bin the data myself. But then, zooming in/out, or changing locations, would always be affected by the regions I've used to define the bins. But other than this, how can I have a better control to what is being shown?

Thanks in advance