I did absolutely the simplest analysis possible, using the isotropic model generated from the data, described in 783. I then placed several spots in a full density configuration (see Figure 2d_example). The figure also shows individual spots which I have placed. Note that the images I have been placing are ``only'' 41x41 images.
I have then extracted the flux in one of the fiber and calculated how much of the flux in that fiber is coming from the different spots. Note that this is simplest boxcar extraction. This is shown in lsf_examples.png. This Figure shows how much flux is due to different fiber in the upper panel, and the lower panel shows the fractional contribution. As we can see, already at 5 pixels from the center of the psf only 50% of the flux is actually coming from the spot placed in that particular fiber.

Many improvements are possible, with main ones being a) more realistic model and b) more realistic extraction.