Interpolating Sweep Advanced Options for Arrays
For an Interpolating Sweep Advanced Options, if you select Use Selected Entries,

Clicking the Select Entries button displays an Interpolation Basis Convergence dialog that lists the Array elements.

Note that the matrix entries are listed according to the Matrix Sort Order as specified by user.
Entry Selection can be All, Diagonal, or Off-Diagonal.
Mode Selection can be All, Dominant Only, or Higher-Order Only.