These file list each 13-crossing projection obtained from
projections of each of the 4878 prime alternating 13-crossing
knots, by changing every subset of the crossings and using 
Knotscape's "knotfind" program to identify them. This process
failed (or rather, timed out) for exactly 26 projections
(in the file "13_error.txt);
each of these, when run through SnapPy, were identified as
the knot K12n694. This python code used to verify this is in
the file "13cr_snappy_errorrun.txt". 

These files separate out all of the resulting knot projections,
according to the crossing number of the underlying knot 
(as reported by knotfind); the file "13_connsum.txt" contains
all knots reported to be a connected sum. Note that the 
DT codes for the summands reported in "13_connsum.txt" are
not (necessarily) the `canonical' DT codes that Knotscape
uses, and, in fact, the reported crossing number is 
sometimes *not* the actual crossing number of the underlying 
knot.