With the IndpntAsk setting, the independent variable (X, T, θ, or n depending on graphing mode) will not be calculated automatically in the table. Instead, when looking at the table, you must select an entry in the independent variable column, press ENTER, and enter a value. The values entered will also be stored to the TblInput list.
(To access the table, press 2nd TABLE, or use the DispTable command in a program)
The alternative, IndpntAuto, fills in several values starting at TblStart and increasing by ΔTbl, and makes the table scrollable (up and down).