Create a scattering kernel

In order to improve the fidelity of simulations, we want to include the ``long-range'' scattering term that we see in the data. Understanding the impact of this scattering is crucial for understanding how well we can extract data from nearby fibers.

This ticket is to create the simplest kernel, based on observed scatter in LAM, with which to convolve the data to simulate this effect. At this point I am aiming to create only a single kernel, without any spatial dependence.