Recall that each column of corresponds to an impulse response. We therefore apply column scaling to imaging operators implemented as push operators. The system we solve is then

(4) |

In equation equ-dat the imaging operator is applied after the data
have been normalized by and, consequently, we will refer
to this normalization as *data normalization*. Again we notice that
has the inverse units of making the output
image unit-less.

Similarly to the imaging fold defined earlier, is
normalization by the coverage of the modeling operator (where ). We will refer to this coverage as
the *modeling fold*.

7/5/1998