The "sinuous line" in the distribution of SNe at intermediate
redshift is a section of the celestial equator which was scanned
over and over again, roughly 20 or 30 times per season,
during the fall of 2005, 2006 and 2007 by the SDSS Supernova Search
team.

  The widely spaced little clumps of SNe at high redshift represent
the small regions selected for intensive study by large telescopes
with small fields of view, such as HST or Subaru.  Most of these
SNe were found by just three teams: the Supernova Cosmology Group
(which used the CTIO 4-m and Subaru 8-m telescopes), the High-Z Supernova 
Search Team (which used CFHT and HST as well as several others), 
and the ESSENCE group (search images taken by the CTIO 4-m telescope).