默认情况下，Magento在区间导航中划分价格，如下所示：
$0.00 - $9.99 (1)
$10.00 - $19.99 (2)
$20.00 - $29.99 (3)
$30.00 - $39.99 (4)
$40.00 - $49.99 (5)
$50.00 and above (6)
有没有办法让这样的间隔改为：
below $10.00 (1)
below $20.00 (3)
below $30.00 (6)
below $40.00 (10)
below $50.00 (15)
$50.00 and above (6)