$ type MOSAIC-PROXY.;
	http www-proxy.domain.com 8080 http
	ftp www-proxy.domain.com 8080 http
	gopher www-proxy.domain.com 8080 http
	$ type MOSAIC-NO_PROXY.;
	domain.com
	localhost
	$
Your best bet is to let NCSA X Mosaic 2.7b2A create these files itself, by
picking "Proxy list" and "no proxy list" from the "File" pull-down.
(It appears that the record format for these files *must* be Stream_LF.)