Disabling all formatting or truncation in SQLplus output

In SQLplus I'm entering a select statement on three fields, 2 NUMERIC  and one LONG. The output is formatted and looks truncated. I would like to see the whole

content of the LONG field (which is a zero terminated character string).

Also I would prefer to not have any formatting lines (like =========== =======). How can I achieve this?

Thank you.

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Christoph