Estimating sizes of indexes

Informix provides very useful tools for estimating sizes of rows in a table. Perhaps I've overlooked it, but I can find nothing about estimating sizes for indexes. In other words, given table X with indexes A, B, and C, how much overhead is required for each additional row in table X? Can this be done easily? Is there somewhere in the documentation where this is covered? Is there any difference in overhead for SE and Online (unfortunately, we have to support both)? TnxInAdvance. -- Jim Kunzman at Teltronics/TCT <jim@tct.uucp>, <uunet!pdn!tct!jim> ----- OS/2 2.0 - 1,400,000+ copies sold. Sweet dreams Mr. Balmy.