Erm, That web page seems to have been mislaid
If you've reached this page then chances are the page you're looking for has been moved and you've been directed here from an old link or bookmark.
You appear to have been looking for this URL: http://www.gondolin.org.uk/hchof/intros/oric-atmos.html
I think the page you now need is this one: http://www.gondolin.org.uk/hchof/hchof.php?id=53
I'll try to redirect you there in a few seconds. If that doesn't work, try clicking on the link instead.