I'm not understanding the results from a data table that I've created (see attached). Table 1 has the incorrect values starting from 477.4648(3500) down. If I change the formula for the column data point "3000" to the constant 3000 the results are correct (Table 2). What is even stranger is Table 3. The results are correct and the same as Table 2, but the formula used to generate the column data doesn't make sense to me. In all three tables the formula for the data table is H9 (upper right for all three tables). I would appreciate any advice or insight for this issue.