exclude some authors in wp_list_authors

hi im using

<?php wp_list_authors('exclude_admin=0'); ?>

to display a list of my authors with links to their corresponding posts.

Since there are 20 authors, the list of authors take up a large amount of vertical space on my sidebar. I’d like to find a way to make them two columns of 10 authors each so as to take up half the space.

i figure the way to do this is to exclude authors 11 to 20 on the first column, then 1 to 10 on the second one. I managed to do that with wp_list_cats, which has ‘exclude’ as one of its parameters.

i cant find a way to do this with authors. Any help please? I’d much appreciate it. Thank you in advance.