Fig. 4.

Beam-separation dependence of the luminosity and of a subset of luminous-region parameters during horizontal vdM scan IV. The points represent a the specific visible interaction rate (or equivalently the specific luminosity), b the horizontal position of the luminous centroid, c, d the horizontal and vertical luminous widths ${\mathit{\sigma }}_{x\mathcal{L}}$ and ${\mathit{\sigma }}_{y\mathcal{L}}$. The red line is the result of the fit described in the text