There are two versions of this website, to cover computers and tablets of different sizes, different architectures, using different browsers, with displays of differing resolution

> > >  Desktop Mac, retina display, Safari browser

> > >  Desktop Mac, non-retina display, Safari browser

Desktop Mac, browser other than Safari;  Apple notebook or iPad, whatever the browser;  desktop or notebook or tablet of different architecture, whatever the browser:  try both entry points and see which is clearer; the difference can be subtle

> > >  Note on Safari and retina display

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