The template for the advanced rule would be something like this
Code:
program:
s = field('series_index');
first_non_empty(
cmp(s, 1.01, '1.png', '', ''),
cmp(s, 2.01, '2.png', '', ''),
cmp(s, 3.01, '3.png', '', ''),
cmp(s, 4.01, '4.png', '', ''),
cmp(s, 5.01, '5.png', '', ''),
cmp(s, 6.01, '6.png', '', ''),
cmp(s, 7.01, '7.png', '', ''),
cmp(s, 8.01, '8.png', '', ''),
cmp(s, 9.01, '9.png', '', ''),
cmp(s, 9.99, '', '', 'bigger.png')
)