You can change it between 1 and 100, being 1 no compression and 100
the maximum compression. Recommended values are above 10. Normally,
if you are accesing this page from a low speed connection, it will
have better perfomance with biggest values (say above 50).
This image is taken from the Calar Alto Maintenance area. You can see east view.
In order to allow the activex control to be loaded (if using IE) and also see
the other available resolutions on this page (right side buttons), you have to
allow pop-ups from caha.es on your browser.
If you have problems with activex control installation, please, dowload activex
here and install it. (But first, be sure you allow pop-ups from caha.es)