Capturing only queries with --echo-hidden option?

Hi.  I was playing with the -E option a bit[1].  If I do for example a \d, the queries and the regular output are interspersed on the screen.  I see I can use \o to send the regular output to a file, leaving only the queries on the screen.  But is there any way to do the reverse (capture the queries to a file, output on screen), and/or send both streams to separate files?