$ type MOSAIC-PROXY.;
http www-proxy.crl.dec.com 8080 http
ftp www-proxy.crl.dec.com 8080 http
gopher www-proxy.crl.dec.com 8080 http
$ type MOSAIC-NO_PROXY.;
dec.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.)