Fig. A.3
Non-linear fits to the surface density profile of the radial distribution of SNe
in Arp 220. Top left: fit to the 19 inner sources in the eastern
nucleus (
).
Top right: fit to the 29 sources in the western nucleus
(
).
Bottom: combined fit for the SNe in the east and west nuclei
(48 sources), yielding 
and 
. We note that
some of the points are in rings where no sources were detected. While their
corresponding surface density is zero, their upper limits were used in the
fit.
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