Jon Claerbout suggested that I should use a filter that had the property that it would destroy plane waves of a given dip. Given such an operator I could perform a joint estimation of the local dip and the missing data values. He suggested a form for such a filter, which he calls the ``plane wave destruction'' filter or the ``wavekill'' operator.

I can reject a dip, *p*, with the operator,

To use this operator for interpolation when the dip is known I minimize the residual,

This is a linear least squares problem of the type described earlier. If the dip is not known I have to solve a non-linear problem for both the dip and the missing data values.

1/13/1998